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 0xf3701ed2cc5a8a35495046afdc085f774cf7ac2595c75f89b7678774d5212aaa. 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/38e319bd-6daf-434f-8c9b-f040e62d4a6b.json and https://artists.proofprofile.net/proofs/artist/38e319bd-6daf-434f-8c9b-f040e62d4a6b.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
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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 0xc5acedf0a0355f66525a484f9f5cee951e6c9e15a2eed74c5aca977acbc9fe0c. 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/BKNU22400232.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x501c2cf3ca693dc1c9673010fcee85643a1fa4af8a05c341768dd57e5791c229. 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/BKNU22400363.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x14799fd500a789eb31c313819ba3c005d90f1c59601d5e5c446066d0d86250cf. 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/BKNU22500045.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a9d6b4d70fc14bdd73fd116795d24c81861978e1d992b60dd2de5331c2617d8. 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/BKNU22500078.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf64b379e4738fe462b2168ff63de3a78f7427696262d3117a49b789f038bedef. 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/BKFUX2301121.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d71183c00e74a608c0058df11724e7d7292d2346d8efa91ec2c3a1932f8b83f. 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/BKDFK2400447.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b0bd4666b618be9d59e67d4039ba0e9963a8845a317f296e8eb6f0ad03dced5. 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/BKDFK2400453.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6cde52e906ff32711bfed72ead50a758f0fa31412d84f82a127599fcfea96d52. 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/BKNU22400109.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1587a98f0f0f9108d718b2c24adb0d9a7663845625c5b00b589da869da861abc. 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/BKNU22400082.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e28596f644fa38d19358ee8c9325942a263272a0142beb4722c0f54cea2b869. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/BKNU22400038.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb836994b36c24319f7e3591edc63cd948273e9f582feb0cb4fcdbc63ae1840f6. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/BKFUX2300704.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ac0f2ade1ca05c84cb80f7e07bc01f4d5957363a4d5981cc9a8f5042276ad18. 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/BKNU22500033.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc00df4e4ffe0670dd2c80c85523f8943f5b85751e2b4e2781784ac54a6061ee5. 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/BKNU22400403.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2521e708c4a81aa0f9fc03e73a0f2a50400c912b8e0561404b3365272584a9e. 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/BKNU22400351.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaefe76d33d8dad4949c16db392937ecdf2742e31a98dd7c2de7ec3c0b15c8532. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), 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/BKNU22400319.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x852799599ee54b94028e56af187020c14a6a8bf93a71fa073ad1a01de16a423d. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/BKNU22500012.