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 0xbff7f583a6ef7d36aff292c517f5343b7500de7352ccf6bc84e1d4b3f79ca2db. 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/5b21af8e-a9be-4095-a49f-efdf12d8396c.json and https://artists.proofprofile.net/proofs/artist/5b21af8e-a9be-4095-a49f-efdf12d8396c.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 0x1f5b1f150b9129ae80b728dd17459fc265381d1734da289012297428dd52c539. Chain 2 (Bitcoin): anchored in block 958817 (2026-07-20T03:52:09Z), 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/TR0391500134.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32124fbbea2f1431125f2d0ea20190bf56fc718e993e36cca8078f401355e036. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/TR0391500141.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x961ea4f0d1202b048a5181b286f17493dd3c71d7b26e995d7393258013e9e885. 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/TR0391500140.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88f9509b108324ffc1366bbbb7941d948227267b79cc6dde5909d70c8c8ebfc2. Chain 2 (Bitcoin): anchored in block 957782 (2026-07-13T00:52:48Z), 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/TR0391500137.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ba7702789e7b60a7007c52748541dfd3a8a111eba637f210d1228f91e5a43ec. Chain 2 (Bitcoin): anchored in block 958335 (2026-07-16T22:37:47Z), 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/TR0391500133.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32124fbbea2f1431125f2d0ea20190bf56fc718e993e36cca8078f401355e036. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/TR0391500141.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x961ea4f0d1202b048a5181b286f17493dd3c71d7b26e995d7393258013e9e885. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/TR0391500140.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3d7f4c6e0827f23e049dbe241188c1db0bf875453d3cc2ffedc8008a950b785. Chain 2 (Bitcoin): anchored in block 958639 (2026-07-19T01:18:30Z), 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/TR0392300383.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xebb1b2b254d08c2f5ed3c36aef3f864982d35de3867a41a97d26a83c121456c3. Chain 2 (Bitcoin): anchored in block 958917 (2026-07-20T17:53:56Z), 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/TR0392300384.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc448fadcc5f645e0e05257cd9226362ec1c6aa189a2fa1285c3d9e803b3e7a7e. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T08:56:04Z), 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/TR0392300385.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9cdb56882737ca5ad7a761a6377fe6f4a94e31c35f3683c1c78eee4536077867. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/TR0392300386.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8f5c51af9152673df8f5cd381f0b8b6260be2ac3b7de37f344bb9dbebbba83c. Chain 2 (Bitcoin): anchored in block 958576 (2026-07-18T16:22:28Z), 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/TR0392300387.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x963e9ada6f977a2812030f9ca1d98008a4a0ada7293a649027bc382fd1715976. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T15:11:23Z), 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/TR0392300388.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3d7f4c6e0827f23e049dbe241188c1db0bf875453d3cc2ffedc8008a950b785. Chain 2 (Bitcoin): anchored in block 958203 (2026-07-15T21:24:46Z), 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/TR0392300383.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xebb1b2b254d08c2f5ed3c36aef3f864982d35de3867a41a97d26a83c121456c3. Chain 2 (Bitcoin): anchored in block 958582 (2026-07-18T16:47:25Z), 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/TR0392300384.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc448fadcc5f645e0e05257cd9226362ec1c6aa189a2fa1285c3d9e803b3e7a7e. 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/TR0392300385.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9cdb56882737ca5ad7a761a6377fe6f4a94e31c35f3683c1c78eee4536077867. Chain 2 (Bitcoin): anchored in block 958204 (2026-07-15T21:33:28Z), 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/TR0392300386.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8f5c51af9152673df8f5cd381f0b8b6260be2ac3b7de37f344bb9dbebbba83c. 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/TR0392300387.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x562272a2d84a24027c0890dfca340a55ef17e43b4c88e289e906131078990ca1. 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/TR0331610805.