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 0xf44b541f3f583f9e06d096621c6b3cfa25f332c473e323c8a5ff82f9d53b6c50. 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/6b1bd1bc-387a-41c0-afc2-ad42ed76ae7d.json and https://artists.proofprofile.net/proofs/artist/6b1bd1bc-387a-41c0-afc2-ad42ed76ae7d.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 0x1796f0400fc62513c0b061b5eb696ffccad6b3d4c57202aa6e7ab52742ecbfed. Chain 2 (Bitcoin): anchored in block 956728 (2026-07-05T01:43:49Z), 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/GX89G2210779.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2788ef61a7be2cb3b11401ad51fca60ba785b54a7782e74383ccebde1164a292. 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/GX89G2211022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63bb11ce847e6679b56cddce95ae77970dabe3d44e3d8faa56d4120f77df03a3. 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/GX89G2211089.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa9e15315fd02d2f620076ae0d29913d4187b067111356b26af0c0464dfd0c0a. Chain 2 (Bitcoin): anchored in block 957754 (2026-07-12T21:26:22Z), 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/GX89G2202259.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6057057a3bac5d04b9a2baf304a96bf9b632b706b3928822d60c655f2a7ba25. Chain 2 (Bitcoin): anchored in block 958111 (2026-07-15T06:58:20Z), 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/GX89G2202387.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5856723a6aa7ff601940af6f23bfe39f3758561374406664a3bc5a614f85a73a. 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/GX89G2202617.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47ea4367a4d61959b2f5708e74a786fa2bbad5899e6241e9cb1108e574a59cbd. 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/GX89G2203006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8868c60757dc3ff7c9f8ba721f3a612f5a05e7fac4c858305677d758e21d01c2. 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/GX89G2208227.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x802d75942d0247868e9cc8e4e49a6b6e54eb196fd15a7f619801704b60d3165d. Chain 2 (Bitcoin): anchored in block 956637 (2026-07-04T10:56:23Z), 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/GX89G2208258.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcbbac361db181602d9ef7bb84e6ef88ea4fd36573807f1b3681594fd1102880f. Chain 2 (Bitcoin): anchored in block 958355 (2026-07-17T03:11:50Z), 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/GX89G2208342.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf30fdd625a4803a2e0b8954d80a8f93533ab8333a8dfc87fc6e2959897f1d1e3. 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/GX89G2208538.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4b22be7afbda13fd0ba6a43475a1cc6457361f8600df7105c98c0a55debc500. 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/GX89G2207947.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23b07b587c184f98eafec514ad0ff28b4681854aaf2622d307025c4f63f92527. 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/GX89G2206816.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0895ae1678dcfcaee582144e98c16b100f04c84dc16f4c83e42b0a5f7f743300. 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/GX89G2206860.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b17fea6f9d5d04b9e09529a54a05a8fa1d0ad8c73ecfdd3416a6fa75f41c42e. Chain 2 (Bitcoin): anchored in block 958176 (2026-07-15T17:14:36Z), 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/GX89G2209815.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4af50133d45bd6d12e885051352e1e2540b13af4303d372202e4a41cc323c8a1. 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/GX89G2209944.