Leftöver Crack is an American punk rock band formed in 1998, following the breakup of Choking Victim. Leftöver Crack spans several different music genres including hardcore punk, ska, and crust punk.
1. Compute SHA-256 of OTSCanonicalRecord value → must equal OTSHash 2. Open OTSProofURL → extract Bitcoin block number → must equal OTSBitcoinBlock 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Read CopyrightID inside OTSCanonicalRecord → must equal the CopyrightID above 5. GET OTSVerificationAPI → pre-computed 6-check result from server 6. If all match: this entity was registered on CopyrightChains at OTSTimestamp, independently verifiable on Bitcoin
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaeb494c42799e7455402d808bcd425ccc66f8850cbf42eb80904f98d56752372. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/03639583-ce40-40e5-8d11-fc7e545b626f.json and https://artists.proofprofile.net/proofs/artist/03639583-ce40-40e5-8d11-fc7e545b626f.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Jesus Has a Place for Me (Rock the 40 Oz.)
1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab6539bd9de2b839cd015c27355823e7799802e3f3aff2a7f509abb5a9854418. Chain 2 (Bitcoin): anchored in block 958067 (2026-07-14T21:26:15Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USBND0800402.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12e397fb951fbd03b4ff72b52973d47369e979c233b486a59c138dc61a77aed4. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USBND0800405.
The Good, the Bad, and the Leftover Crack
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcfa01ebd682d5132c6b8465d0313476617267e8eeb2c7b3a7a33ffaf45be1b16. Chain 2 (Bitcoin): anchored in block 958552 (2026-07-18T13:15:29Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USBND0800406.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4442b0c4ff7689ef8e6cf3a03025f56727afefa96c187fbb361cf2fe6a4ba97a. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USHEL0317102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x776405aeb42e87f6bbd1037502af9602836a1065bca310f39f42f0e80adfee24. Chain 2 (Bitcoin): anchored in block 958212 (2026-07-15T23:25:50Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USHEL0317106.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcbbfa0024877a8fbeb1c2561055a75b7e177dcf48ca51fbf14694084b5833142. Chain 2 (Bitcoin): anchored in block 956576 (2026-07-04T02:06:47Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USHEL0317107.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c7376ae1858972090246cbf9a2df7831c08c37e0bfbfb63ed8d1bded9dbc0b3. Chain 2 (Bitcoin): anchored in block 958211 (2026-07-16T02:19:05Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USHEL0317110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x154ae772fd4b3b553726ccd7df293c81d35de7b6bb6ac278a55d24797870417e. Chain 2 (Bitcoin): anchored in block 958067 (2026-07-14T21:26:15Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USHEL0317111.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1823e015fee161573a6591ab1e663c94a4d8144ff8ddf9a4f94a8baf87beebbd. Chain 2 (Bitcoin): anchored in block 956560 (2026-07-03T23:28:02Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USHEL0317113.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x120c9a8e7076c8c13a52d619a191b787afcaa511b33207f8fbc7727d6866ee29. Chain 2 (Bitcoin): anchored in block 956738 (2026-07-05T04:47:21Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USBND0800702.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26d7f3940a50836456a939634c5e8b04fe22eaca5fac4969e52ba426c98235cd. Chain 2 (Bitcoin): anchored in block 958728 (2026-07-19T12:24:55Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USBND0800703.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83c65534dc66a70b6266d3ac29c48da7dcd41ed50ba0946ed48cf40fb6ea296a. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USBND0800704.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x902affde984f8124abb90dcb135fd167aea80c5ef47ec9cc960c7a0424447f7f. Chain 2 (Bitcoin): anchored in block 956576 (2026-07-04T02:06:47Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USBND0800708.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x232eaa1e70a9505707a5127835474b2ba2fc08837efcb8654e2ca19185114455. Chain 2 (Bitcoin): anchored in block 958069 (2026-07-14T21:37:55Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QMDA62106952.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a0b1d1556438c3ec35f70219416943d88093ff8fb5103cebf9b69b1da7171ee. Chain 2 (Bitcoin): anchored in block 958245 (2026-07-16T08:22:17Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QMDA62106898.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c173978e4f5d35cadd266bc3f3c81d649ff8d5faa4bd146106d78eea6b54c9a. Chain 2 (Bitcoin): anchored in block 956476 (2026-07-03T09:04:44Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QMDA62106902.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13b31adaadde8682c932ae42d3fad5f1b842545dd7a96b1d856eb61d64472323. Chain 2 (Bitcoin): anchored in block 956484 (2026-07-03T10:47:44Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QMDA62106905.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca6b6d229b85b8a2b70d63a70e0b980cbf97e32359194b76b296ce02e5576e2c. Chain 2 (Bitcoin): anchored in block 958203 (2026-07-15T23:32:24Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QMDA62106906.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83dc61d4b998d3fbc2e0d24cffac1ecc488bad71e4585d8cfc213c1e2e94a44a. Chain 2 (Bitcoin): anchored in block 957620 (2026-07-11T22:32:56Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QMDA62106907.
Vicious Constructs (feat. Penny Rimbaud)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1de13e388fd848ac1307aa091169cd07001b38290ff788b717712afbc750713. Chain 2 (Bitcoin): anchored in block 958245 (2026-07-16T08:34:00Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QMDA62106908.
Amanecer de los Muertos (feat. Joe Jack Talcum; Mischief Brew)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x323616eab1c3b58c1c2bb3297470b6104beafbc3fa3aa94bc1f97cb1a77a1937. Chain 2 (Bitcoin): anchored in block 958544 (2026-07-18T12:14:37Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QMDA62106909.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x342cdcb7cdd815a67a83b4be3ddfb368dd1bf4b9598fc6e1cd7e8c46ed95b205. Chain 2 (Bitcoin): anchored in block 958256 (2026-07-16T07:22:18Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QMDA62108457.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2202481b0bf4039721818b0e3ec80c0c68f137175d708cb9fabf22ad8f629f93. Chain 2 (Bitcoin): anchored in block 958346 (2026-07-17T03:56:13Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QMDA62108458.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb5d37368ea6f00ca2514bd73d291bb3cb41d63c60b271e39f196ad527844d2a. Chain 2 (Bitcoin): anchored in block 958705 (2026-07-19T08:43:25Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QMDA62108459.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xabf34ac613916c6ec0f04684b2d11649402485fc3aa2c9b1d21a44be35dac89f. Chain 2 (Bitcoin): anchored in block 958700 (2026-07-19T08:09:50Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QMDA62108460.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8dc8a2ab83936fec9627879a5a53eec5ed7683260246196f9bbb12b0a581b2f4. Chain 2 (Bitcoin): anchored in block 958765 (2026-07-19T20:53:52Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QMDA62108461.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29434c59ccc62d7d304fe84b353794ae294ed36f87f1df4a42309fc7a83be2bf. Chain 2 (Bitcoin): anchored in block 958711 (2026-07-19T09:26:32Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QMDA62108462.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe896861a284d2a674462f5a2aee311d96e51f9f74ff12532ce508d320741249e. Chain 2 (Bitcoin): anchored in block 958447 (2026-07-17T19:47:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QMDA62108464.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa14598f27221bd4e3941aef67fc9e017af803047416b3ee56448c06f2da877fd. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QMDA62108467.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x132c89cfd4239aa7a6223b457e38271aaeda3a3f48cbb786e2e41e7ce3540d8f. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QMDA62108468.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40bfcfd5cb1c3366bb31781db1623edafba0a5b63d2e9e977f8ef9f633369878. Chain 2 (Bitcoin): anchored in block 956857 (2026-07-06T01:26:17Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QMDA62108471.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea86cba67efec3172e02b936fffc646aa3180e9a94572e24b64a13e1fcf5e08b. Chain 2 (Bitcoin): anchored in block 958711 (2026-07-19T09:26:32Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QMDA62108472.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda2eaa06c7fc7e95132eed6fe7fa501594bc84b17dfebb77f463c68859113cd5. Chain 2 (Bitcoin): anchored in block 958771 (2026-07-19T21:37:05Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QMDA62108474.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb4fc69d8b398863cc0b3d3dd543cf11151b1364a37958fcf6b777a4d320af50. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QMDA62108475.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3dbecc71f0bf0e718dd8043d9e602486bfbede38b59242b4c6b9f5d8e037abd9. Chain 2 (Bitcoin): anchored in block 958484 (2026-07-18T03:34:53Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QMDA62108476.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd533e819e071f750019a4852d9027f561087623221a8e7f5f8fea4638a733574. Chain 2 (Bitcoin): anchored in block 958771 (2026-07-19T22:03:31Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QMDA62108477.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03da7b1b7e4a98c756dd9c527bb78bdc72973cb30b39421e3d24daf9442db9f1. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QMDA62108478.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f9e7a307cae8ca9c1e17762dc3c9503a61bccd5127a36ba40b0168cde45543e. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QMDA62108484.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x10e856fef9b040ad606898290a61816dbee8e3ae5309c8d01770aee395b3eb0f. Chain 2 (Bitcoin): anchored in block 958346 (2026-07-17T04:04:33Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QMDA62108485.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03d8700087e99f07c56a3d838827a768a4b316c06a24f33aeacd81a7bcebee4a. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USHEL0317109.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa462183307885ca4ad12cd51d0093db62602d1844d0b051934b7eb8891754540. Chain 2 (Bitcoin): anchored in block 957046 (2026-07-07T14:04:01Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USFW41594916.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1836b5ab54d4f11cc0049d7466e3c9650ad1c0711b01d696e9221c877cbe205e. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USHEL0317103.
1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch