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 0x72c3d8ac3769c4888e362594b2f8bfe88e304270ce60af73dc47c59c8dc84e28. 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/0773f37b-fab8-4844-bb5b-1fcb2fce8ed9.json and https://artists.proofprofile.net/proofs/artist/0773f37b-fab8-4844-bb5b-1fcb2fce8ed9.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 0x76120f0d87fde9d1f60433fd108056ac801d59187a37d985fdf66addb832391b. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/QZK6N2041862.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c0b89c4b2502113ed888d3fed6c93ae57e80fc28fd1d41375ed798735846589. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/US3DF2099936.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x375e2d5a96670366d82b23545102648175507940aa6bebeaf3dda6c8ed134e22. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/QZNWY2033707.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7781e9440088d658f3ed87276d583dc53d96368ae5c7a949d6ad17dfe8923b2. Chain 2 (Bitcoin): anchored in block 958366 (2026-07-17T04:59:09Z), 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/QZS672125050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc80e86a33d647014fb51718954ec3df3d95806f5ca4eb0b4fa49044f946f9fdd. Chain 2 (Bitcoin): anchored in block 958975 (2026-07-21T06:12:52Z), 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/QM42K2234044.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5987200ba4bfc999739396bdd0fdb2f1d00e69b55ed3866d235d3e7550746f2. Chain 2 (Bitcoin): anchored in block 958980 (2026-07-21T07:04:12Z), 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/US3DF2244425.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ba6ddd1ae4339ab1ea82125f2f460965cb28e0453a35ab4c7ad7b45c1994f39. Chain 2 (Bitcoin): anchored in block 958140 (2026-07-15T10:05:23Z), 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/US3DF2244431.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa126c7f68a6a0ce32ed5cd6bbe6fa7ce6ac1666e0ee4d519109b47055e638575. 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/UKZGC2300989.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0890e80b639110a920d622c94bee305c3461256b210eed16fdea3d268dbf142. 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/QZN882247545.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb49547e387435e50ac29e97785bdd173dd21771ca7886725db589515194b4075. 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/UKZGC2302607.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88d3a086f120c38a86ddf174697bea09f2d8fdb5c2c61ac5bdb7833eb42f0a37. 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/QM3DF2277841.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb722d714954708127439c06e10f50a2b02522f48c04781882bfd811937b8baa0. 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/UKZGC2404972.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce42a2b0a24d9a7ed3b9c87e80d8700fd29bd5898e23b9868213faa02d5bd72b. Chain 2 (Bitcoin): anchored in block 960125 (2026-07-29T15:38:18Z), 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/UKZGC2300094.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb06d06aacea66bde59f66f0a371d2a2fb1ec09ae02b3b8691b7a06f1c12e5660. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/UKZGC2406964.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8e484727ec5f3ef25a5ef3a76afa2625985d65de7146c8d75ebf5ed5689e43c. Chain 2 (Bitcoin): anchored in block 960340 (2026-07-31T03:15:04Z), 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/UKZGC2304225.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85dc88c268898f9b27406abfcd415806db898315b4966660e5a82962c3508247. 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/UKZGC2202101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x048c539d91451b1881380ea66ac0d4d9247815559390238dd90db65928800395. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/UKZGC2404252.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad0a68a2682aec9240bfa4d87a50b6611d63bac8f9bcea17f2e2166bdf449844. 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/UKZGC2203773.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77f72f94da17462ac27296c7b8e4092c6464dd6dd09d00cf22398f52624e9662. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/UKZGC2404435.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd8bc6fcc75a286eee25159abd50115d908f724a612eec4baea07136c1e9325b. Chain 2 (Bitcoin): anchored in block 960095 (2026-07-29T11:07:37Z), 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/UKZGC2403610.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca99eb091af7c031ece5937773c11a5306d8c02a5d1f4157d0c0cb3a3ed29e67. 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/QZK6J2120037.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1307546133927c70d80abedbe6cb15c7c3076652a4fa5c13ede66b80c786e35f. 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/QM3DF2215981.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x201c2a266635c21d587d26ca1194598abb244dd6e25cd7bb2fdbcda1ff746bad. Chain 2 (Bitcoin): anchored in block 960121 (2026-07-29T15:22:21Z), 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/UKZGC2403103.