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 0xf2da6631dfcf46d1b92dce0a93b8d2300f88960568ab21aba74e29a97bbdae59. 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/3b8e48c6-4177-43da-89cd-abccca7ae262.json and https://artists.proofprofile.net/proofs/artist/3b8e48c6-4177-43da-89cd-abccca7ae262.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 0x1112128c58b8a9d24955ae31a137dc7c68af11082c4decdf116f2158cb813d77. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/QZHN32552495.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7541b476f83f90beb2239ba8c4317d4dfecb5e2c513268142602326f5a86db66. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/QZHN52534582.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c12549931abcd6ab4bb1637a96c3c8b9c559f35db68ec71df6600132fff684d. Chain 2 (Bitcoin): anchored in block 959132 (2026-07-22T13:20:46Z), 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/QZHN52534585.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdede5cdc691daa93fbb94e23195bd4b9d158b3720956fa99f71ccd90d4ad45f5. Chain 2 (Bitcoin): anchored in block 958087 (2026-07-15T02:56:49Z), 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/QZHN52534587.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd453c7561dc5838ccbc5230a2822a91bef9724ad4ac9d6c259f2e1f43d98b6f2. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/QZHN52534589.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99bf32e88e50467e8c70e3ee79a6ae38138f1b33f125892c2e67905c4a880bf7. Chain 2 (Bitcoin): anchored in block 958169 (2026-07-15T16:16:18Z), 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/QZHN92567340.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8bf50b6f7b1a8e2910205cbc292f9eeefb689f8eb9c2a652c246b3a23e806d8a. Chain 2 (Bitcoin): anchored in block 958541 (2026-07-18T11:37:54Z), 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/QZHN92567341.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaee91e528cac5b0a8163f9c465e6340e63b2cec966ec5bd4a2c793305dbc6e10. Chain 2 (Bitcoin): anchored in block 958228 (2026-07-16T02:46:47Z), 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/QZHN92567342.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa35305e049041d9c4c15245a49f032f517ed1c4e71df79bcbd7b82cc291f9648. Chain 2 (Bitcoin): anchored in block 958228 (2026-07-16T02:46:47Z), 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/QZHN92567343.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd4754b155be2330d8c9e2ef8786a9999ba728ae35334450631b825a8131f76a. Chain 2 (Bitcoin): anchored in block 958176 (2026-07-15T17:14:36Z), 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/QZHN92567344.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e87158b8584cd997dd3ed0a7739760b82fe4a89933ebaed52b52660bc30eb6e. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/QZHNC2532434.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x038d6ef49564da66b5cea86da880f1fa540bfc13cb4e82fb50025d9f9e821ca5. 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/QZHNC2532435.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07ee2d6257ba85434ac0af4d23e2299d6d9c57fb0aadba80cc48c96144afa01d. Chain 2 (Bitcoin): anchored in block 958455 (2026-07-17T21:28:36Z), 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/QZHNC2532436.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7d6c9dba1bf4ef0afefd96ffbae456691b653eb2f33a2c6ecd98df47f80eb75. Chain 2 (Bitcoin): anchored in block 958357 (2026-07-17T03:33:42Z), 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/QZHNC2532437.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x601f90df75ae40b74160825689ec65a7610e269a786ae16d473cabc376596ec1. Chain 2 (Bitcoin): anchored in block 959008 (2026-07-21T13:14:05Z), 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/QZHNC2532438.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65ab98701b8e51a5d7f3dacc1f1fe931ecb4faaadcd380858af4e74aafc8dbc8. Chain 2 (Bitcoin): anchored in block 958796 (2026-07-20T00:01:46Z), 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/QZK6H2525279.