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 0xa3030f4f6584a7b586dfc782e6548b288e7264dd6e08a0ac581557dbb57a34e0. 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/9b2ab813-e502-4f9a-a42b-24f5df77c4d3.json and https://artists.proofprofile.net/proofs/artist/9b2ab813-e502-4f9a-a42b-24f5df77c4d3.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 0x2189a9e1e7275504933ee6700cae0397bc3e96536ab4a41684ddd4a55d73785c. Chain 2 (Bitcoin): anchored in block 958788 (2026-07-19T22:07:06Z), 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/QZMEM2360927.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0203f33d13ec3780f4fba1c279f3480ef2d1c133fb7c5c27848d7abfab589630. Chain 2 (Bitcoin): anchored in block 958541 (2026-07-18T11:37:54Z), 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/QZMEN2301462.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a0108ba477876b5ee709b15a17f77654f98e8c5892578944bc1d7a528ca481a. Chain 2 (Bitcoin): anchored in block 958720 (2026-07-19T10:53:46Z), 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/QZNWV2305110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1316753b0687571a26ba8a3576a6c8af1a753e31951ae31eefbdc4404ad64942. 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/QZTBE2330765.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7484dc12664cd196bf95ad165ed643171780bf6a95e869589a91f6deb588ae43. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/QZTBC2323248.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2408ec865fc930d74abd66bff1f34580530a3149e49b11dd73596e0052954aa3. 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/QZTB82341769.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xedffe904d310bce04d17c9faba17a7a1124919b16e5c0fbf03fb6ce880c36fdf. Chain 2 (Bitcoin): anchored in block 958690 (2026-07-19T07:14:39Z), 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/QZTB52317195.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ab95426ad1cc540043ac65124b332aa58ab6d860b1e0b1e789eb996104a3e85. Chain 2 (Bitcoin): anchored in block 959037 (2026-07-21T16:59:47Z), 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/QZTAY2377706.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x461fc717a90075a2c013baea9eb4b2a92b9adfe916c25018a3bdbde4ce6482ed. Chain 2 (Bitcoin): anchored in block 957556 (2026-07-11T11:14:07Z), 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/NLRD52062958.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b612b93f352cf5e9f2f478c6b80a3e79ce8fb8fedb61fcdb1a90816050b8b81. Chain 2 (Bitcoin): anchored in block 958153 (2026-07-15T12:03:04Z), 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/NLRD52355053.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4991abdb97fd9c375bd0980da9ce64e575637857e895656cc0e5df69bf1de91. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/NLRD52413705.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75327439f513e225943f45310cc05219ae0fad9c864bac9e95eb1c3cb0eabece. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/NLRD52413741.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf86f07112b9cc8eaae78075e831999d3d4c3f60d46781b81cc8d08c8c2fe26c3. Chain 2 (Bitcoin): anchored in block 957872 (2026-07-13T15:39:45Z), 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/NL3M12409424.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa856bf0f92318c9fb120e8e0cf2e98d3b035d6147adea26a4158527bbed6fca5. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/NL3M12409416.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40525a643cadffc491eba1b7fc5f8a1fbb9b448a67ed2c3c6705386432136d59. Chain 2 (Bitcoin): anchored in block 958331 (2026-07-16T21:55:37Z), 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/NL3M12409442.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2809e595ae5aba5bc1bc8e1da13fc4d5bcb17c28afda959dbc9d529bcef4ed7b. 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/NL3M12409450.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe527867e674a8d9b4c4c555a3af418fa6a641eaa70b6ea0bd517424d9fbf2e1a. 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/NL3M12409465.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab6e339d2b0f6463b805563654828b4cb4b55be6b08fda3a4eab7917e35e7344. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/NL3M12409482.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9056c4e2f4a5e0c4b1de081b9fa6af4532af75a129a19710323684080cb2e4a3. Chain 2 (Bitcoin): anchored in block 958873 (2026-07-20T11:48:10Z), 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/NL3M12409490.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a42fbdc77c7cdc359693e6b64bdc7e045f378db49e561b3a1a327117797ebab. Chain 2 (Bitcoin): anchored in block 958839 (2026-07-20T07:01:59Z), 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/NL3M12409498.