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 0x4d1bebd10d91866ec88effa06bc1ed5d2a2f35ab9cb8d3b5f34dee5de9200c76. Chain 2 (Bitcoin): anchored in block 953758 (2026-06-15T07:48:25Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/b177f2d3-ad76-4334-a0ef-f9bf0d9ac3bd.json and https://artists.proofprofile.net/proofs/artist/b177f2d3-ad76-4334-a0ef-f9bf0d9ac3bd.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 0xc940835046bad90a6b91b35bc10fa7e5e15276bc210a37007b93d8bcad800949. 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/BX9OR2500007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc87cb76ea3c0134db7b19c2408e5904f67132030a36cd01a75a21d0f6be9ac8d. 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/SGB502561048.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x982bc2500be42bf438705ba169b67d222f611c0f72767775b73c55625f071658. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/BX9OR2400053.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d2613161d6344475983b73775a31b23f0bd9d6afc9bb877905bdcdcf6b2b064. Chain 2 (Bitcoin): anchored in block 960339 (2026-07-31T03:13:37Z), 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/BX9OR2400050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x09042c31a26c4ac600dddf86bfff90f0e46108108d1d50346971758a20dc2c98. 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/BX9OR2400047.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92664423d779a2b99917acb1cffd3713bc0026cd218c9e6286d52be57d539704. 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/BRVWJ2400156.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1f7e8537ccfc747d8b4b0bbaec5bc69a8190387e5fd25182d67645ca73fb6b3. 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/BX9OR2400032.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f7d21ab087e40e820b888e5fe984325864b81b89af1f8456cd1e585a83e36b8. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/BRVWJ2400109.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c9e3e0c4f3989a47ef9468a2f76b2bce200c1a448ba74fe2e297f3a851f49d5. 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/GXD7V2280588.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbda25ee8585e1a3b198bc8f2f39f1c4a0194226f885a0a9ae69bcc4d91d2042b. Chain 2 (Bitcoin): anchored in block 960111 (2026-07-29T13:21:01Z), 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/BRVWJ2400100.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1db01e267f5d7aa170860e86781be3682195be645d3a61672aa492f050af1d18. Chain 2 (Bitcoin): anchored in block 960167 (2026-07-29T23:42:34Z), 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/BX9OR2400022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x400ca084266225f692c3713be6ab80f6f3c266ec7d64422c964ba95428959979. Chain 2 (Bitcoin): anchored in block 960429 (2026-07-31T16:07:24Z), 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/GXBAV2280669.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63916f481c6360b354a078cf9d26fec9598786f529d103dc019feba3c171aad9. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/BX9OR2400020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98316b1b84e051fc618b80e89c8471e3955b654bea2a63f844b6d1bd52ac5df5. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/QZNJY2327105.