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 0x5f81db0ac61dcc211847515dbc6b79b92c1fc23c79d211c0b4881aff3e1cce74. Chain 2 (Bitcoin): anchored in block 954533 (2026-06-20T08:57:02Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/a6d491c0-7937-4833-a0fc-342ea2fffbe7.json and https://artists.proofprofile.net/proofs/artist/a6d491c0-7937-4833-a0fc-342ea2fffbe7.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 0x21ec1ef3d9ad3e38c0bf0e128eb0235d5f5dd08f8d7bfa928b5a8f86f974a3e1. 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/QZK6G2569851.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5473accd8d3a8a5853541b08b3d6e1e4fd4d77f10224bb166db0e4513b8fb6c7. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/QZK6G2569852.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x459e86d9d63bb702ce592b13121851515a181e1bb508d8cb15bcffa381989592. 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/QZK6G2569853.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78892d91a3c61c013ed83ca27115c4d3960f18ab02e299d8a46c4443ece5d611. 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/QZK6G2569856.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc909bd2239a57023e8b096182e1c327dad72679eb93bdb5e57e63ac079fba373. Chain 2 (Bitcoin): anchored in block 959118 (2026-07-22T10:01:58Z), 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/QZK6G2569857.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x343cf454f2b98d5808abcf0aa8cdf4af732825921af50e273becbb49fc59b9e2. 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/QZMEM2515783.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78c7c8b0158f8fef549776cb34753de100b43ad184fa5496e6691886cc7c65f3. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/QZMEM2515784.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x676b8b8d9836c118c87fc83f09f235fba9fca5214c7fcce3f22a613c9cc09e32. Chain 2 (Bitcoin): anchored in block 958627 (2026-07-18T23:33:54Z), 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/QZMEM2515785.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x485c5e2a3c48f7a438e0ffc7cf8a3e94246c8bcf15b712b6e72432da64db016d. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/QZMEM2515786.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26c4af920e2a323c5598581ff1d034976667beee67f71f6ed7b6a3bbf970450d. Chain 2 (Bitcoin): anchored in block 958582 (2026-07-18T16:47:25Z), 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/QZMEQ2558502.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3cca03cf6f90d715f53e299d1c7e9dc14ff55cb8df4d49357061ceac03b14021. Chain 2 (Bitcoin): anchored in block 958110 (2026-07-15T06:57:12Z), 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/QZMEQ2580548.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2fb352494cc9c12d0fed8161ac718e29f38f3dc21513814ff95cd1567cc4cfdd. Chain 2 (Bitcoin): anchored in block 959107 (2026-07-22T07:19:23Z), 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/QZNWZ2585121.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00a11e8809aae3b9477fa05d96dd4561a121df96d1c9b22096cacf5914870de9. Chain 2 (Bitcoin): anchored in block 956861 (2026-07-06T01:57:57Z), 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/QZNWZ2585122.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1357bb8ba814e01276d3261e5d23f2e6444228740ac1282fa677c705c58a06c. Chain 2 (Bitcoin): anchored in block 956859 (2026-07-06T01:42:12Z), 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/QZNWZ2585123.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0119168dc74dcb82b7c0f51217daa2336ca948205b7f3d7cd54c18d4f52c1cb. Chain 2 (Bitcoin): anchored in block 958853 (2026-07-20T09:11:53Z), 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/QZNWZ2585124.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89d5b7bd088421a669ac1288e3f99064e0895cf804b2fca061ec2d1941da470d. Chain 2 (Bitcoin): anchored in block 959138 (2026-07-22T14:10:55Z), 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/QZNWZ2585126.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b619b911912309ea9a656a04a4651f407f24c4b728849b024e3fb5af1c027d8. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T08:41:42Z), 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/QZNWZ2585127.