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 0xf1564c920bda37cbc0885ec86f917966cf7e772810f3beaa627c576512b8b229. 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/ba6e5fc3-ad90-4eef-b99a-57201bc8315d.json and https://artists.proofprofile.net/proofs/artist/ba6e5fc3-ad90-4eef-b99a-57201bc8315d.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 0x65f62965bf7ef8237d69a9b05c261b85bfb06ed060380f7295fc8b4122329df5. Chain 2 (Bitcoin): anchored in block 960370 (2026-07-31T08:38:45Z), 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/TCAFW2194727.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0dfde8a497465727617825bef65567168c49ce2df614a1ba1133d69f6e9c1d21. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/TCAFW2194734.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x931e7fe4e0e37fa2396a54d4b941708e5522a6d534cbb18449353b889727bd39. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/TCAFW2194742.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1870f23c10b79b8f6883f795e24bf73f1b87445c6b343f4ddd2b9e0999bce479. Chain 2 (Bitcoin): anchored in block 960314 (2026-07-30T21:00:46Z), 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/TCAFW2194753.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1107d1b17945ad258d6b95b07d13e7871b319e181613d9f4bf60e8ef867e9ff. Chain 2 (Bitcoin): anchored in block 960108 (2026-07-29T13:09:35Z), 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/TCAFW2194755.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9c5b144c7d164335f0a4218b6bf3b41c328816fcb42784a4b5c499dc6aba6c4. 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/TCAFW2194758.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x037e6437431700b1fe2cff2fd64ee0c99d739b4ebdf631ee8051eae1d91f05f2. Chain 2 (Bitcoin): anchored in block 960456 (2026-07-31T19:53:57Z), 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/TCAFW2194761.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ff03da14421b73fa8397d896954e5c04f19ffad5e34d0e116419a2b715a1576. Chain 2 (Bitcoin): anchored in block 960354 (2026-07-31T05:48:18Z), 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/TCAFW2194764.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9cf0d63e1820cc2ed5ca831cbd3a556f3f72189c4e19b266bf9254ef929bd00f. 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/TCAFW2194765.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa56919cc7091a8917bd9235b8e9164e627a5d879c43dd5dd9790f79eaa355a5a. 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/TCAFW2194767.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x308fabf79cb0bee0782f8a18017eb3c8811accdab9d268ac42318f82344074a5. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/TCAFW2194771.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a56676959e06cabd123a04fe450379c32b8967d1b89246beee0bb85ad8070ea. Chain 2 (Bitcoin): anchored in block 960456 (2026-07-31T19:53:57Z), 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/TCAFW2194775.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77577537e2df551a46b0965b24e46bf2bb1804da743d3b29404feb6315f5630f. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/TCAFW2194779.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e0b655bf116497accba8c62849c412eb88eb8d0898496dcdd2647b4d8325089. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/TCAFW2194782.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6054928bbc3f886982c6d42a4e0077da11e6595ad0a709eabfb7645b11592ff1. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/TCAFW2194787.