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 0xc9f49732b62f52774eb01c07d7a2f1c6b14735470b97466fcf8052b5d427ed28. Chain 2 (Bitcoin): anchored in block 953817 (2026-06-15T18:10:31Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/fec79f4d-81b8-4e88-a141-559b7ecfab6a.json and https://artists.proofprofile.net/proofs/artist/fec79f4d-81b8-4e88-a141-559b7ecfab6a.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 0x152b908af03019eb872ee686f49d2b6787032438233ae2c2dbe0e945b07454df. Chain 2 (Bitcoin): anchored in block 960250 (2026-07-30T11:13:28Z), 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/GB6ZW2200628.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75e16e18b81f821fc4a4c6f62fa3e4e2cdc9a47b4d197dbe26302ee27970d1b3. 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/GB6ZW2200629.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbfc2b6157e5002589583c474c005be4700d26c4b3143bcbff76a7ad0706652de. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/GB6ZW2200630.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde685463ccf9982197a0604d80b4519ba99de039cb239f32ad1c2bfcfe810957. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/GB6ZW2200631.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5e71040fedc4b25598a869bdf534866696ff004c5f4033da1ef01a3837dff79. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/GB6ZW2200632.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87a6eb1523c4ead0c0684e8c15e972cb37d58f50a2f69854dc9f47249008c51d. 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/GB6ZW2200633.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x752a0715bd331056b8fce4f5981cbc3bee9ed0ae6296c1390c58da38540bfd7e. Chain 2 (Bitcoin): anchored in block 957061 (2026-07-07T16:07:00Z), 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/GB6ZW2200634.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4743cc3658e6bd299b9365be7ae79b83bfdb74bf317935b9843f14dc19eddcd. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/GB6ZW2200635.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4d5ca85cff26167f50badc633ba7f17ef3feb6c8cb15ee807d7da8770c3a1d0. 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/GB6ZW2200636.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbdbf23e6018bb8651ca4174b42894da8d3bd9642f5ad843931025dd32ceb91bd. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/GB6ZW2200637.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdddfaee1a82212a49e0331cc4192da4a003ac83f62f59e19d8e1969283acfb88. Chain 2 (Bitcoin): anchored in block 960362 (2026-07-31T06:58:00Z), 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/GB6ZW2200638.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f7eb1e8e3b86626b0080ffd28a7614633329d4aea3422c011ea6495d06042c4. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/GB6ZW2200639.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x276bd702d5a3921e17ffbc46ba188fb6a2b37e93e51f3144fcfd245227ce1ecc. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/GB6ZW2200640.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0d8e5f21b52c827c7fa2e9dc646012c4fc0c0952fc7120a6c1ee836ffa350b6. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/GB6ZW2200641.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11c4fec75e289eea35a224f2c0190a3ba71633fe52410d1740b44f751397e418. 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/GB6ZW2200642.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18616e90b4f21017a0f4e59c086e7e18cbcb2f061d63fd5168d9b157accf33f6. 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/GB6ZW2200643.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf59578913a4c0c7ad186bfbb9426978385ffa5e15a91ece12e89c82e9055485. 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/GB6ZW2200644.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea6e4190a539414749e52912fa572e84880ef9d5a2af22f6a7fe4d13345008f7. 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/QZHN82388490.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8994c388127c83b8e5ead8a915f1d6f3734a3b60a1d0bb5dbecacc805b409ec. Chain 2 (Bitcoin): anchored in block 960379 (2026-07-31T09:25:34Z), 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/GB8KE2307824.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9c4e259a5c3ce0e367f8824c376518b003daab00e478c736f42ed0902050870. 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/GB8KE1850310.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06887489b17a083681232b5593a5d50d724f9f3ebd88eac713d9e04f4abb7ebf. 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/GB8KE2151702.