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 0x6dbcd360cb4797afc440decefe4979851194de08ccf1b372a83b2f015e7a095a. 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/66a8d9f3-9fb7-4d84-b9cb-0ceb0211e012.json and https://artists.proofprofile.net/proofs/artist/66a8d9f3-9fb7-4d84-b9cb-0ceb0211e012.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 0x2938fab822735b12d29bc2316ffd756e9ace14c15168c986ca7675998a577941. 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/TCAFA2003649.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda4a6044c699d3dc611854d7e9aca981b8757c1f0da4050bc4c25b0c435a290e. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/TCAFA2003900.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7da75caf99c5e1c3449def266b35108462459572903942ec51169f581ccf2b2b. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/TCAFA2003914.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1372030f1c41781a9c4c93b80c0f5ff64721686e29c4d98756e8b4f0237e77ce. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/TCAFA2003929.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f55ac365ffa970094883ed24d5f2e32def32e4c87dff3d6df61ef14652a2709. 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/TCAFA2004008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x271d77a372bfdb8f5899568f2047dcf9b801b34833b56a0ca8b34d50df461b95. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/TCAFA2003960.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f6637172e3f37d3f68ae7eb1a64127b37ae68c200fb5396d66c8b75967dc226. 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/TCAFA2004022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d6cdc2e320fdc8cba1c7feca433a50c5e8d2d67d4fd4381dbe099a7c5684acb. 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/TCAFA2003991.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01cb7f23cc7dbaf0d827b6c9a2fe5293c178ca14d4c40106f39daacbaf5ba7a1. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/TCAFA2003949.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x070452be79a8e3ec7d7f67ef18bf1242caed3ca9af417b1e327c530b065613c6. 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/TCAFA2004005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b72bd4445283186a3b1a6dedb9604ff5148e94e7d5256c4131ab2f48ca7eeb7. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/TCAFA2004001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93d09241a4a89df526e78e544f6528fc59c0c447598b81c9dbbccc75d21c628b. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QZNMV2237761.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9d1f466c234b3a9f3aa4af8b5874a16887368a404d51686df2ddbbb03c0bf47. Chain 2 (Bitcoin): anchored in block 959069 (2026-07-21T22:32:59Z), 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/QZNMV2245082.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x51a79c08a44aee220148f2a2cb92b18c2ec852db5fe7da3518dc7c81e2cddcaa. Chain 2 (Bitcoin): anchored in block 958547 (2026-07-18T12:44:05Z), 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/QZQAY2365639.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe97a2c759a60074b26bf537596a257775a7623ce7a1dee0f71853291bfd7fd7b. Chain 2 (Bitcoin): anchored in block 958917 (2026-07-20T17:53:56Z), 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/QZQAY2390915.