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 0x1a255ab72ec7faa4f39fc5135e528d227a28fe629f32d18e34a54e6089cace89. 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/df006414-47f3-4e2a-8391-e20ed0116302.json and https://artists.proofprofile.net/proofs/artist/df006414-47f3-4e2a-8391-e20ed0116302.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 0x0886abd36a28375fa121c0f5cfd7a27e1316fffda6562ea2fed08f3aa6fb8804. Chain 2 (Bitcoin): anchored in block 958716 (2026-07-19T10:15:55Z), 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/ITL941600156.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5d2ae1ca997950b3fb289f5f0ab5ebead120311f379d1ae1072727147c77cb4. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/ITL941600134.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4c1b3d9e7035b9fa806fd7f5ddc56ed9a2118dc18677f33baa7da5affb10785. 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/ITL941600143.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72367bd6c388f0e917728fdfa9aa9d5c659b31b873d9e959f237110ba1575f77. Chain 2 (Bitcoin): anchored in block 958543 (2026-07-18T11:58:44Z), 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/ITL941600144.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d93f0360a6c378d448dbd48063d42d5ec45a1c140925b987ce777d1ad04db4a. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/ITL941600176.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c13a1a2546e9044f2a46628b60b592ac1bd74589c7288f3cbaddfd41eec1e30. Chain 2 (Bitcoin): anchored in block 958905 (2026-07-20T16:14:34Z), 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/ITL941600180.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7890220f4acc8d066d6bd31fe10d2bb7ebc7b7d6a9766a9b741011a7bd9d29e. Chain 2 (Bitcoin): anchored in block 958060 (2026-07-14T20:39:42Z), 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/ITL941600183.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73dcb4d01c9009ec9f89ad7adee6e055cce34cb93fe77f271ecd9fdbbf2b5b31. 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/ITL941600189.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98c5e290d9cb9e8aadb0623342440d8af2bf59c37bf6c0f42dd29f3f564fd8f1. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/ITL941600191.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6b2746fc8c4addb3ad17cfcc2060a71a721b4413f3cb163b44fea1eaa8ec1c0. 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/ITL941600192.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31388bfbe706c618a275965987bc352deb12414048e4bdc447e546f8606a0e1f. Chain 2 (Bitcoin): anchored in block 958058 (2026-07-14T20:20:34Z), 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/ITL941600197.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf26e5a07272f0ef609f9b7880283d3e95ed88519f89df7e813536a80804f42f7. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/DEBL61189512.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd4b389903bdd0c25b88b5c5b3499125f33887c56e7cee857e630f677c6f363a. Chain 2 (Bitcoin): anchored in block 959105 (2026-07-22T06:33:30Z), 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/ITL941700031.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0360d6b79143649dc50df480229a21d2363bf2581db0d074bcabb69da1962b96. Chain 2 (Bitcoin): anchored in block 958686 (2026-07-19T06:43:29Z), 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/ITL941700037.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66c50953ded33e15a45a7b5aadf698a7320250c0abd7c3ca6ad256c12ec3ede8. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/ITL941700040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77ec830d9dce8b8efb6442e1feb1e8995c9ef5beddd6f70856838701fd6bd3e2. 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/TCAHX2474674.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf603746d88dc7416f247009a5c98d2389961d2b4a3250b43f0fe8bfc2bf262b7. 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/ITG370300013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd912c8bb3f2851e4f28b8bd5ce5e7c923c2da5bae2e2e4135b742f8244a35dc. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/ITG370300024.