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 0x268ffa10d6532085dd800af640afe1e8efc173a2e56f8f8bd29e2b3435bc1205. 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/016ba0ef-9a1e-4fa4-a10e-a526c11eba72.json and https://artists.proofprofile.net/proofs/artist/016ba0ef-9a1e-4fa4-a10e-a526c11eba72.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 0x878c9ad8e688d34b8c07394c71096f87b815d8da60327dcbd4876b2d12ea8a85. Chain 2 (Bitcoin): anchored in block 958383 (2026-07-17T08:20:01Z), 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/USCGH1225074.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x896611c72cb1bdb4d76630312ab9ded904341733a6209e2b45cf908145d5ac88. Chain 2 (Bitcoin): anchored in block 958965 (2026-07-21T04:29:05Z), 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/USCGH1225075.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2d8359e032891c1c48a5576abc7291409c084b3671a163738f9387baae766b8. Chain 2 (Bitcoin): anchored in block 958975 (2026-07-21T06:12:52Z), 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/USCGH1225076.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x036a4ab213a2cc6c551533c857f073c72fc968a2c47690ddb60005e540ab9f96. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/USCGH1225077.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x980e64cbaee8568031d6ea05386bee134db38f96db3135f1acd1ea21f6ec31de. 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/USCGH1225079.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ae5ccc0953ec43fbd8b2088ea0cd82cb4312869c89915fc031aecf082890aca. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/USHM21411027.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec74c966e292676b2a591adcd0b66678d2ead32f4748b4338e90b95ff7de4ae3. 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/USHM21411028.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54e5f7c64d0558ae32ffbb53204e70d0bd4a56e893ba13e25f18f6e0cba70e25. 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/USHM21411029.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8b3663006ddd5d354a60f36f9147c18ee2288c0f9d0cf885843be7c17c6ce96. Chain 2 (Bitcoin): anchored in block 957550 (2026-07-11T09:54:43Z), 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/USHM21411033.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3e2e19ca1b728473c4471de34ec0c3427f7eb4137b0c2e0197052f7cd78ca1e. 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/USHM21411034.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5208bde1e7830d85c3ae559509fee213bc4eca1e85c8debc4942ee00e03ef2de. 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/USCGH1870647.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88e18104c3f4c3df05b8d128bc4237ac56c13f2d16c8e42ddd150e513701e3f7. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/QMAAK1822960.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe59f7e21f58cd18f17d270c3d856c7b9beaf0d4af84128de7019e9c983dfcf2d. Chain 2 (Bitcoin): anchored in block 957888 (2026-07-13T17:43:59Z), 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/QMAAK1822961.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00e83196ea91ad2cda46a9f3e5b02bfa0e69b9737345e0248f02d64d174b1fae. Chain 2 (Bitcoin): anchored in block 958653 (2026-07-19T03:54:23Z), 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/QMAAK1822962.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67be6fd7938910c93b78eee9b6ed5977b8d6e3acc56f4d6f5e43a5421ab09a51. 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/QMAAK1822963.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b2e65dd63253aa54ae27f4907b1aa8afad564240731d255a8a85a1f0818f8ff. 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/QMAAK1822966.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9edaebee87b4426e8895d6aa53c8d111ab98525c7fcdf391faecbcdc27132977. Chain 2 (Bitcoin): anchored in block 958126 (2026-07-15T08:17:14Z), 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/QMAAK1822968.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc71dba8de73a6aca67fe6d88b0af86b2c552d5fa81a889332b00a1890b38a7f6. Chain 2 (Bitcoin): anchored in block 958054 (2026-07-14T19:33:24Z), 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/USCGJ2189731.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd96fa9fcb7236f28bdc1d4f4260577e49d689eddf694c39fefc4a54c27a14de5. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/USCGJ2269876.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1e9c512c92206bbe59d85763d922375e1379d5a29e7ddc762b0a1097b554e08. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/USCGJ2269877.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c235d3c227f9de9ceec39a1130c349d8677177bd767e5e1c2ee1eeb7101c95a. 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/USCGJ2269878.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9df090531c51945186c02b24ebcecc595a369e7137fc12713ecfa73a94ca93f3. Chain 2 (Bitcoin): anchored in block 958756 (2026-07-19T16:12:29Z), 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/USCGH2590049.