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 0x95b2e7cebda45db579ff75c3dcedebb0301f6e2677dc4a754d95b18e696fe652. Chain 2 (Bitcoin): anchored in block 953610 (2026-06-14T07:58:09Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/1442c418-e9c5-46b5-b12c-2e25ff5f158c.json and https://artists.proofprofile.net/proofs/artist/1442c418-e9c5-46b5-b12c-2e25ff5f158c.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 0xee669da670d97bc3b0eb7a32789c38c27f27726f8fc517d240a4f4387fc9c312. 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/TCAEQ2072693.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73cf6a7b2a4428fcbaa01573f4f1be57821895409a030f55825e2a60c62cf235. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/TCAEN1903415.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd894952faae8bb14c0d89cc08360dfc0555d0a35c7fa09049e4534b1e29de5a7. 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/NL1AP1800942.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6bba750bf61cbd211f9aecfb41a74cf22d1173b8fbf915f4464efe59fbe8992. 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/TCAEL1936308.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8fbcb86d831f4a38e8c8df7826a69fecb7c745f88fbc2c751bb69265887e0248. 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/TCAEC1947217.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa977f1a7bcd9ac8d07e3259a152f9a9cecab2df30990ac786b980c8570715ea5. Chain 2 (Bitcoin): anchored in block 960166 (2026-07-29T23:39:29Z), 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/TCAEL1946990.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a210642425bfbc652a4c848e530795d6c1b6c8b73fa75a43686e4334f3c4e8d. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/TCAEE1954040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16f9d383d2b930f5492de748a1d9df60b8a1d3c52031c2cae2cc7105b66debb0. Chain 2 (Bitcoin): anchored in block 957048 (2026-07-07T14:18:56Z), 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/TCAEC1952846.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe835bf0a7c06885e1b624b0a4aae57d963beda806012a24919d5fc584f776fb4. Chain 2 (Bitcoin): anchored in block 957048 (2026-07-07T14:18:56Z), 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/TCADX1804342.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54d14dcbd8816b12beb4d2c4788bcea6a8bfb6580a8b54e0120f34b5d48f60f1. Chain 2 (Bitcoin): anchored in block 957046 (2026-07-07T14:04:01Z), 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/TCAEE1934213.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xefb37ea29a3b7b2ed2c036c877dde434b11b5bd4f27daa4c178df834052285c7. 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/SE6TI2190416.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77ad2feaf7d9ae69d7a039c572a659fd18d8b645f7682df48ae3c4c7b5f22152. 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/SE6QE2151535.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3a0a061bf503007d6e7af3de7f5d54f756653cfbe4a4f129ffc122e353b7ed0. 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/SE6HN2105734.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c10178a55542846b38104b6302a16a0b0ef69e121fefaa57bcce1e1dc59b874. 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/TCAES2027294.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25df84251f41a2f9d39786053e54e253576410729b3b30d644cf3528c2daad56. 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/SE6A92028699.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe675cc2698214522a42dda0b6398b7d3e3955c04a1659080edbcced3c513efd. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/SE5BU2095744.