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 0x2584e75ed19003b10905e990520fc1a8334aef091aee767c91d1b96f29a2b1f8. 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/51fb2fff-6dac-4151-8c3b-9d36a7f15d2b.json and https://artists.proofprofile.net/proofs/artist/51fb2fff-6dac-4151-8c3b-9d36a7f15d2b.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 0xa18624773e94945c9b0258ff1f0eb1890e1ef3f08cc997320e8384561ecaa8ad. Chain 2 (Bitcoin): anchored in block 957833 (2026-07-13T09:36:32Z), 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/CARJ01600010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68f1273eaf28b1cda9b3b82c4aba0359bb6b189e8c1e6b571535ece0ee2e147e. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/CARJ01900001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd38c3f3d7a1b77f04140c3f86d02d3497023bc0537b7d47dd6a1ca83131ddea. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/CARJ01904002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b5456aa3e5303c69e0cb0c9b4d19fa69156d31b114d4f3af6f2b76b349d9c31. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/CARJ01904004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7bf654cf207abb5bead18f4a1485c83953495f3581a2b13441f8f3ed3fc89459. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/CARJ01904005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa919f26cc9a096f11c56c7d5d47e9a41443c6f1283348353289111c922d03380. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/CARJ01904006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6edbbc35977521987fe0ffff397766a422d8484ad9391c1fd5f45470497295ee. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/CARJ01904008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2cff7842b5444ba19e559f2603f19d19134adee311ff752f3cd659584b78563. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/CARJ01904010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc2bb9648f3e78142c39bc1bbae8cd2589ed82703fe78219ab1685a3303c2ad2. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/CARJ01904011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd5cc7a819f907d2c1c75801c5bca31be78b9a69aa6ff3b05f0ddf212a109a27. Chain 2 (Bitcoin): anchored in block 957833 (2026-07-13T09:36:32Z), 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/CARJ01904012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xefe4d46609b83fd9c429c28cefbe8718e118c755ca128d07da8a411e7dc339d7. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/CAF662301040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab5ad882a4817bd731a409497162f3a9e5d06657069b206655a2cbc0f53c1228. Chain 2 (Bitcoin): anchored in block 957898 (2026-07-13T19:28:48Z), 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/CAF662301041.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c857cd119fe14634a9fdf49f4e2d3024ba4c01d5c2d36a0f800dc18313cc312. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/CAL642075003.