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 0x7ae5b58e6d99bde7287abd74a7f094b7103194eabd8b613ea0b16aedec993cb3. 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/20735baa-2d10-4188-83a1-394b749f4ebd.json and https://artists.proofprofile.net/proofs/artist/20735baa-2d10-4188-83a1-394b749f4ebd.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 0x143f196d8b2127c058070852e2c917e331973183c5ffa0ac5b7b92e2fff658ca. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T19:55:02Z), 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/QM3DF2272724.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8e18959d8acc5032a4a44730650e5fbae3a0d234edc90997462a95e7e0d4be3. 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/DEQ022291266.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a6ff685963660a7f8c74208d7b07d4cf5a4980af58f3cc856985ac34c46c9d6. 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/DEQ022291267.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd007b5a6550b8b3cdafca145fbfeaeb4c5d03aea3a2d225453085d79e6cc5c41. 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/DEQ022117763.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x10eebf3cd3f04f628421031998d2ba1cb6cf7ff1eec9083166a25506f91e1d14. 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/DEQ022117764.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7522123678bf3edb4feb2cb73b64340660790369bf37db8d1ecd995374c82d2d. 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/DEQ022117765.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d14914da81bfa3520a413855f8db8e46f70bb80c9c6d776463d991e07603d58. 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/DEQ022117767.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74aee3d329e0d7569792671f41d9b2d422c169fb974df6a25fad996e09c94780. 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/DEQ022117770.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05787256ff7d550d8e06bcdd837e4dc3368b1e96da077944e9b9a3d7270d1904. 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/DGA092353555.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2de20c08d505fc250f33e2bc78488d6bc5d9b56860cf8d97228085fe99149ca5. 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/US3DF2280148.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b7088f0d893cf09e5db4af1e99290ca8a121f71cc710d5c54739e122af37317. 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/FRX872436308.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52fa54562deb005675442ad2de276682fdf05aafb3e17270434ce2bde92be1fa. 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/FRX872436309.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75379ad7d9fda5a5593afdf7c29d51360d626c988822595971554b3e78264762. 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/FRX872436304.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa39af59815072a6927083c5d89d9f0c82279d6dc848c6049a4a228a286ddd2b2. 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/FRX872436307.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66642622ea650be62b32ae160e3dc4c5e5cd1045e6a16998ae2b16c1f15595ce. 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/US3DF2507894.