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 0x3894972b833d34c2be822a112b59c7a1ce6df4e3aae9b7084c9713f554d17af8. 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/8ed0d7ef-ca6f-4e2f-8930-2074e2dcc174.json and https://artists.proofprofile.net/proofs/artist/8ed0d7ef-ca6f-4e2f-8930-2074e2dcc174.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 0xd2254aa78bc60aff8dff7fec2d17727fa8e8537e21803990648e2378adf25f71. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/QZNAW2102001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb39cc3af22b62ccf3731616c4a3a8ef00f3955cc5025bddce25ae570505dc3a4. Chain 2 (Bitcoin): anchored in block 958547 (2026-07-18T12:44:05Z), 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/QZNAW2102002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6491567790e9fef6d20db39f5d8192c2f653ad5c53a925f37ae863f75065e701. Chain 2 (Bitcoin): anchored in block 959355 (2026-07-24T03:24:16Z), 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/QM4TW2559380.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1fffbe963b6b1483e5f4f7b3cb472e729844c9e008c259581e3598b60b618626. Chain 2 (Bitcoin): anchored in block 958180 (2026-07-15T17:59:52Z), 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/QM4TW2559375.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a0fc8e0ec2f49f1bc69efa19b2e07fb4a789b801a02a078f6330ed3e40e4a7f. Chain 2 (Bitcoin): anchored in block 958390 (2026-07-17T09:35:49Z), 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/QM4TW2559376.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc72c01c73bbfc7366d92f8beec0d6d94a4c547aa898792655d8c989320b68d18. 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/QM4TW2559377.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99470e893894c3569305a562b3c9c75c82e8ec01914ddf48acee55729bf742b7. Chain 2 (Bitcoin): anchored in block 958329 (2026-07-16T21:48:38Z), 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/QM4TW2559379.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf575de8c5a360de17468dc7e79addc4088fb40a9c18690f2c0343d9c4b07d137. 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/QM4TW2559381.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4caf0bd495964410cd239691b1f704439e56288e7f01f274965b898c86011f2f. Chain 2 (Bitcoin): anchored in block 958377 (2026-07-17T06:48:00Z), 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/QM4TW2559382.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ee036d03401602fec8abca4d0139ee107d216f3d52c92fae239f6fcd5d7bca2. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T13:14:32Z), 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/QM4TW2559383.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d57160a64bbb07ee09f52563df9538f0ba0f6270933b1ff560ccf38fd08e283. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/GBDMT2400416.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6bd24872d034e93180b7306f52cf5d0a14afbca58a34a7e3a003178102fee28c. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/GBDMT2200192.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2249212ad27d82ddd2732e31d39ad01aa6a431e3cdcf19c59995e729a161d2d. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/GBDMT2100302.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3632d3dd47338310ced4a36f371ea1c833d2de7ef09f5649cabd59330993d1ab. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/GBDMT2000352.