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 0x96ee4d62f6f46d7a294a2e715560a3f42e2ef98d171dd72c521190a3b7c1579b. 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/ef8e6721-3c97-4579-869a-5f3cd77a724a.json and https://artists.proofprofile.net/proofs/artist/ef8e6721-3c97-4579-869a-5f3cd77a724a.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 0x2d3bdfa20aac0ba3a9c3ddbe9871149affd8af4d1eb6525c005d8f3a86aeb256. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/QZFZ72046120.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b71195d53426efaf7a0160ab896622196cd461294f6511a315333aa2b882323. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T15:22:58Z), 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/QZES62164865.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b71195d53426efaf7a0160ab896622196cd461294f6511a315333aa2b882323. Chain 2 (Bitcoin): anchored in block 958607 (2026-07-18T21:01:11Z), 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/QZES62164865.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x583b9b12468716ac409df1ff07b078fdcdff220ee2a5363bade414543c85bf75. Chain 2 (Bitcoin): anchored in block 958969 (2026-07-21T04:58:13Z), 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/QZHZ32207794.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe17b6b1aa241a8ce9719a3e0913e32bf2a9cf1f5a4ca07b49cf4ba41703fa58. Chain 2 (Bitcoin): anchored in block 958867 (2026-07-20T11:08:30Z), 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/QZW9K2277010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe17b6b1aa241a8ce9719a3e0913e32bf2a9cf1f5a4ca07b49cf4ba41703fa58. Chain 2 (Bitcoin): anchored in block 958905 (2026-07-20T16:14:34Z), 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/QZW9K2277010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x026357c4fc65395fbea32479d42ccf45763bae8f12e9e127ff9e4101183a2a4a. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/QZ5AB2314230.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ba777fd0f72c5556ad203c3edb82fe78b9a74059fa4bcbf9b9f1e7a6e27923b. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/QZTVM2434307.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ba777fd0f72c5556ad203c3edb82fe78b9a74059fa4bcbf9b9f1e7a6e27923b. Chain 2 (Bitcoin): anchored in block 959018 (2026-07-21T14:12:28Z), 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/QZTVM2434307.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6cdbfad9784d137b3bef584963c46417abdbb13760b34bce7da7c5d4635da1de. Chain 2 (Bitcoin): anchored in block 960247 (2026-07-30T10:42:33Z), 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/QMFME2354070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2d37e68c110becbad86d2817ccbbdac3722010e06357755474c8c4d95e1d203. 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/QM6N22497321.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe1798bd6bf6d7d64656da632dbdfd465264784fe4b907c53592c42879439100. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/QZHZ42144476.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73582eaffd86130e6093a2ec7b54c0f40f78934734d3c4fede3241b5dd7c9268. 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/QZHN32062838.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89ed3a3fa9ef7eb7339fe333941f1a9a6a159714475e33799bbf2875cec3c663. 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/QZK6J2153979.