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 0xc2af76ed123e71e25ef051781f570bd76d0f4dc9d0112b0d419ec8e46e9e8033. Chain 2 (Bitcoin): anchored in block 954058 (2026-06-17T06:34:31Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/44e4e322-1de4-4101-8ef3-42e531a2e4e6.json and https://artists.proofprofile.net/proofs/artist/44e4e322-1de4-4101-8ef3-42e531a2e4e6.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 0x7362837dcad76fa83ce65d50f6df9b8bb29b88e83aeae92861994beab9e65a36. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/ITI021700137.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x532f763af31a39eeb7b89e6fc0e68d80457d982d05241651f1a06f9f3c786776. Chain 2 (Bitcoin): anchored in block 960410 (2026-07-31T13:50:38Z), 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/ITI021700139.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ac01b148234bea917c91a54a466c4372a9d05f373ac25471d43fe7f8bc3b4ef. Chain 2 (Bitcoin): anchored in block 960300 (2026-07-30T19:42:40Z), 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/ITI021700145.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b13cfc925c13869f70ac6b4dabe7081f6568f6c697ee4a7dc42a689c360bcfc. Chain 2 (Bitcoin): anchored in block 960258 (2026-07-30T12:45:34Z), 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/ITI021300498.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd13ff456da6bc34f0a509038870802c96af9fb824916795b0f1c6e73d2514a30. Chain 2 (Bitcoin): anchored in block 960164 (2026-07-29T23:23:05Z), 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/ITI021300499.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x173575c749520b11d5cfa0487872ef5bb59f303098def78af0d7830d597d1c8e. Chain 2 (Bitcoin): anchored in block 957050 (2026-07-07T14:41:13Z), 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/ITI021300500.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa76db2aae3483b1641ecec51c3b5deaf3b81f937a8a304616f6ccf57881b9c8f. Chain 2 (Bitcoin): anchored in block 960203 (2026-07-30T03:35:13Z), 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/ITI021300501.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30d8d32f1bea0800b9f676270301afaa5c10b5458baccdfff170df1901e18fa2. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/ITI021300502.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc48f52edb197bd2db0d44ff6df629466c00b2f4808aa8b936915358bbf25de95. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/ITI021300503.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01f1d8e1eb0fd3455eb3f42d1b667024bee8f05d083933cf2c9f2a34331aab1e. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/ITI021300504.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe72c6e70b486e2ac16b1c4040b3191991bd1d76980390e401966ba57b354e6d. Chain 2 (Bitcoin): anchored in block 960212 (2026-07-30T05:43:45Z), 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/ITI021300505.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x011688b1397045d5bfe026a7e73e8a6f9bb62235ffa3244cbfd3f6c1b47196e8. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/ITI021300506.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9774943b4e51b3d16bc16a52f3c6228c99abfa37b72ba9751c0e1b90bc3fcc59. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/ITI021300507.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x889872bc2dccc869ac22938bdf16de37433f8034de1a6066795a003ae738a7da. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/ITI021300508.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21fd19369befefa56a995300be29466aa46fc2cc81a13ca55ee914ef6c3443e4. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/ITI021300630.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17394832e6b8fc2563ff34e70ce4979f3e18cae5585d3929f3edd098e99b8e8f. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/ITI021300624.