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 0xca107e2e69c0f1fe257589b769facc1f6af6c997014b8bf32030384d789b8109. Chain 2 (Bitcoin): anchored in block 954631 (2026-06-21T02:46:24Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/d0343fb5-704a-480b-8a8d-e8f7053d2613.json and https://artists.proofprofile.net/proofs/artist/d0343fb5-704a-480b-8a8d-e8f7053d2613.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 0x11404aea015eee0155b3a76ae426f01ae4b5d6964113f13d20a224b8d62b29d3. 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/QT3F72562578.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa594eeb731ff7bbdb819095a4437e44bfbf16a56223fc8287cd59e585aa6a07e. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/QT3F82524336.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f71c31cd5c6bd2c30d3ee82990ffd618f6b147ac64e4abbd3d286235232d54d. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/QT3F82521731.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81e894a0171920da9948634be4e70fcdda0759da3361002cb1d0aaf01eb7c4df. Chain 2 (Bitcoin): anchored in block 959146 (2026-07-22T15:41:47Z), 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/QT3F82518801.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45dea078c3c71f85d676659a5a228852cb9e5031185ab1c906b29cfe908f4d56. 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/QT3F82518818.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54f464dc86a5f6c3887c362af88f140cf5fe1cc3845c553a5329438b5a10019b. Chain 2 (Bitcoin): anchored in block 959137 (2026-07-22T14:03:35Z), 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/QT3F92516582.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0367890d633edff5dd62f55e394f0f23cb69ea9246c16da412bd56820dc9cffc. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/QT3F92514089.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a47c0b53c40042dd7038189bfd3ffac978f9e45ac731e7a21ada5dac1e5a81c. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/QT3F92516523.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd610fa33eabfa1d4b1a57de1174a286b0bb56be9c39b504f6247f7e795195d72. Chain 2 (Bitcoin): anchored in block 959137 (2026-07-22T14:03:35Z), 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/QT3F92516513.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04bee50ac9a3fe31858974b649f7bdfd530da1bf65ada82bf66229f5ce1bf72f. Chain 2 (Bitcoin): anchored in block 957788 (2026-07-13T02:37:37Z), 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/QT6EA2527393.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d57390ad84aca23f14d4a18c0e01e1090a202edf8f148ebf11d81edb4f03ec5. Chain 2 (Bitcoin): anchored in block 958476 (2026-07-18T01:26:56Z), 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/QT6EA2521351.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe038b62cb660dc9155d5fa003ab535db9da3b64663929800d44b934bb7de5626. 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/QT6EE2589915.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca2a76f6b30199704e50554c87c5162329c50295f056321438db17297f881a9a. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/QT6EE2589922.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcafa1a2a21b473b69c047f883b000deace3fd24b4a3f7242d9e96a7c579a4e86. 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/QT6EE2587682.
The London Prospect Files (Hidden Voices)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4bb8f5296cf6982671ea596a973d30b95618b051b25168817cd89affab0431b. 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/QT6EF2507489.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42913581b1921ecebf2f0611ce3dbff4d7a3e4b74d7f6982acebac19737b67ab. 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/QT6EF2507490.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf63889b1a15a93cfae4cf5744b8598864b5315d59d9bc0585e5d80adff83c320. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/QT6EF2507491.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x179c7687c365420d6fcdc0addd5f75f173633c206ef4446271c7986f145a0595. Chain 2 (Bitcoin): anchored in block 958491 (2026-07-18T04:29:42Z), 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/QT6EF2507492.