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 0x830adcbfd4612847f2881d66f42e36b079b3ad05e24687a34965fd6d9f53a4ac. Chain 2 (Bitcoin): anchored in block 953408 (2026-06-12T19:28:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/4ac5bd52-44be-4777-b0a1-da35a6316071.json and https://artists.proofprofile.net/proofs/artist/4ac5bd52-44be-4777-b0a1-da35a6316071.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 0x2eed6e79d7b43b64c3f1118e1f8552f33d77db7eb452c1c6423b5d864cebf71e. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QMDA62415453.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38b097f6b5e76b042312b9f81e033104335437f17324707a443f0f8f2a720972. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QM7282416272.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac635d047bcf9a9f134cff8cf7ccea7e1746e90cdfa21148f260223fabcfdc0e. 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/QM6P42419467.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x966a45795749267883fb125d5f4b53f9f7bea2206b6778fd254c03a46df3eb06. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/JP92N2405297.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec048746ea9c3d6ac51ec5004c762ed6f4f697cf3950a3ddfdc57c230222b656. 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/JP92N2366492.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4cbf3e94ab4bfc16b9235b0a5b0aeda76676b75909e1116638e7167ae50fe4f. 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/TCJPU2371153.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf88625d50b92356cc4e7a7d97d4c8e06629d6945d48d5db6b8885abd7d27fcaa. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QM6P42572763.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4258043b66ea3ebd62abea15d18649ee3ee2756471fa2b2b573110a1d567e5cf. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QM4TX2589749.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72904a48a9ff930bbcb705316de6937a26ed650e87d2f762b45ed678259c454b. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/QM4TW2533093.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x818884445016146f5d4646e2e4404a4a92e0dd634b181ea468bec318caaf0df2. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QMDA62497219.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec048746ea9c3d6ac51ec5004c762ed6f4f697cf3950a3ddfdc57c230222b656. 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/JP92N2366492.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3503f02b2802ba899eddce4cef39190d7558bec865629cc34351559498b828d6. 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/JP92N2417591.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac635d047bcf9a9f134cff8cf7ccea7e1746e90cdfa21148f260223fabcfdc0e. 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/QM6P42419467.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2eed6e79d7b43b64c3f1118e1f8552f33d77db7eb452c1c6423b5d864cebf71e. 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/QMDA62415453.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d0cbfb807aa33dc50a1f47f4de1db14ac1326124fe0cafe51cc12c67ee9dbd6. 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/QM7282435226.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3503f02b2802ba899eddce4cef39190d7558bec865629cc34351559498b828d6. 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/JP92N2417591.