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 0xbd630e664f6a36080a33e944c2045234e163ccd1c4d9bd01330334f2b9d090e2. 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/77766760-f39b-41b9-a365-6d59b197a7cb.json and https://artists.proofprofile.net/proofs/artist/77766760-f39b-41b9-a365-6d59b197a7cb.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 0x3c72d51aec94d7216c772c2b758326fdcd84f644b688470882ab8696ce5daf28. 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/BC1WB2400007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0862d7994ffbc220815469e0f8ad378853fe2ab06b126f1d691d9e326c55869. 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/BC1WB2400006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9dc67826d4c167eaff546d8464f8443e2d1a148950126fd3b4dd2c7fc4cae684. 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/BC1WB2400012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0ff16bb4efd7d7df764c46bd8543bd5c9c3217002fd7998df8650c94f12e099. 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/BC1WB2300008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbdd81eaf176893c04f8ef1dda7d80b3a51cfdf07fbc086b106208e3303e342ba. 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/BC1WB2300010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6fc5da8b4339e3364499536ea6013ed9fa15e22fc80390e55ab1d8048b0fc3c4. 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/BC1WB2200008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6addc3a2ee0bc6a45cff7c8cb40a02f1b94e235f2ab0dd1e94d88d8a9b08b229. 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/BC1WB2500001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c72d51aec94d7216c772c2b758326fdcd84f644b688470882ab8696ce5daf28. 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/BC1WB2400007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9dc67826d4c167eaff546d8464f8443e2d1a148950126fd3b4dd2c7fc4cae684. 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/BC1WB2400012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0ff16bb4efd7d7df764c46bd8543bd5c9c3217002fd7998df8650c94f12e099. 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/BC1WB2300008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34c13973cc7a9a852ccf18e7bbdb9326a1f1bdb2c45e8f109bce0350f1daf49b. 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/BKG212400010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc618188f0e588e31d670b4f1132e92c978da7dcb955a064311d939bf7bcf6af1. 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/GXD7G2478564.