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 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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3af52c2dbaafe39afe1820ee73221c35124b7a61bc5a163b6179e190bb1c89aa. 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/fdf000ea-00e2-4deb-974a-6acdc7e4defa.json and https://artists.proofprofile.net/proofs/artist/fdf000ea-00e2-4deb-974a-6acdc7e4defa.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96cca87b82b17e1a965d249f50ee34c6e447205d218077ff67a2a41f99351da4. Chain 2 (Bitcoin): anchored in block 958771 (2026-07-19T19:27:18Z), 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/QZK6G2237955.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0493ec0a5936d1c6e8491159a6a7f1689042467a73bf5c5d7fcd04e5e6401c00. Chain 2 (Bitcoin): anchored in block 958742 (2026-07-19T14:09:34Z), 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/QZTB32242339.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x748c7a68f2570695fbe5bf3b342fc39c9949d76aec5a0abf1dba0b33d057eb22. 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/QZTB32242340.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdcb152dc34c666b4aeb1d2322097d37809c86e1647ebeae494fb51d6849bd828. Chain 2 (Bitcoin): anchored in block 958943 (2026-07-21T00:27:37Z), 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/QZTB32242343.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c7a01dec32d9621d929f50fca0bbd0713255908d4fed247a27e724816f4591a. Chain 2 (Bitcoin): anchored in block 958448 (2026-07-17T19:49:21Z), 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/QZTB42285601.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9052e84b7faa2dcb4ef2cd019152a936e5234b47032ba11e802d7db1105734b7. Chain 2 (Bitcoin): anchored in block 958680 (2026-07-19T06:04:14Z), 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/QZES62342656.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa73fe93a9aaeb80cec2bd08b41b468143e0c802193a55474b63c72849d141ea3. 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/QZES62342659.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xedaf027a148842ab3282e7daddce936560fe491c77b312af5e30adcd5aaf42da. Chain 2 (Bitcoin): anchored in block 958805 (2026-07-20T02:22:58Z), 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/QZHN32321568.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef42fba8ff1c98546557f5aed874ffa2e8b191cd6e4e15f7a4c3334ee71fb45f. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QZNWR2322242.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a1c0fa6693700f20e3dd3b80173bf9bccd376110bcec7e8812f86b50b906671. Chain 2 (Bitcoin): anchored in block 958600 (2026-07-18T19:24:05Z), 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/QZNWR2322243.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3526f8b64995b355c6b2e802932e9f3320dac766e95e192b531e58c998adf83f. Chain 2 (Bitcoin): anchored in block 958714 (2026-07-19T09:51:44Z), 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/QZNWR2322244.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb04643fd0b15d03b4bcde235cbcdcf942a825aa9c97e5837e7215090a86f56bd. 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/QZNWV2368290.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7af7086ce075e2b0443e5b85dd77a5277bb7b06a26aefde523fd469349598cfb. Chain 2 (Bitcoin): anchored in block 958805 (2026-07-20T02:22:58Z), 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/QZPLS2382581.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0c808cb839d7607c1603f8196e6d5876c48c6029aa0a76f85df526682dc2a91. 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/QZTAT2337679.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4eb72d2f891f45e7803742d9c5bdbe4b32c8b282a122cb9f7c2652247c069b41. 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/QZTAX2364884.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18c4bc17694ad73a6bb5ff1623866c680a068904dce8d6a5802c982bf673e677. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T02:01:41Z), 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/QZTAX2365994.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1508c339fdb1cd2e316f2c884205a1162f30f73701f4bd6077b95385b85a3b99. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/QZHN72419646.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x951df0a132e4d4c1662ef4a07647010a4aa651d7ba537f92844b31fc3b82502a. 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/QZWFR2316453.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x976e452350e650ed29801e0245d72878ff03086f1bd74665b5d6e8d3cd1bd6c8. 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/QZHN82413210.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc901af939482cbd6f9cb351cf57403c0a097b600fef99298674b97f58aa7799. 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/QZHN92420875.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78005cea3c65e5a62636ab18bd887f6d9c2418b08a58151275bd017f52953162. 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/USHM82419020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3ca9156b7fd785a7a3383494a8e1ce873ed581f17713541d9b99bc802cde07e. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/USHM82419023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x464c78ac6e76b2a817a56661f2c86cb78c9b77377a38b5091395a6c7b6451435. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/USHM82419024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c9903434776b9badd04659a16882d57b7c933eb9b0aacda9d1d7df3bb19111c. Chain 2 (Bitcoin): anchored in block 958455 (2026-07-17T21:28:36Z), 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/USHM82419026.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1767d09f0c92e20047b88f7b58928b5207137ee8237d347c457540edd5b5e396. 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/USHM82419027.