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 0x17b46dc7cd732c5ccfdafe6d8b70025a6b3c7d234e457be7719b674327c3e1da. 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/a7145b45-b608-4242-81a7-1889c637ca1e.json and https://artists.proofprofile.net/proofs/artist/a7145b45-b608-4242-81a7-1889c637ca1e.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 0xdb3b8245f4339e1fce996730619abf4c492d8c721871214463b9379e482fc62f. Chain 2 (Bitcoin): anchored in block 958166 (2026-07-15T15:55:19Z), 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/QZZ8B2348869.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4a5ba340ed7a97831f76c34b2376e3bad470443693e44a208909b76bc56cbc3. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/QZZ8B2348866.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde8cea9a2bb1ab644339abd567f89329589e4b587741b7472a79ed65eb5282a1. 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/QZZ8B2348944.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4832d1d57c9dae775d5b42ebe16701ba2f54eaa53a6fa430251e2b4acd1a835. Chain 2 (Bitcoin): anchored in block 958208 (2026-07-15T22:40:25Z), 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/QZZ8B2348945.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46563fd22d513cb7997b363f84429475df408433e493d9d9325046a957f2d28b. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/QZZ8B2348868.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21b9ad077358498b21ea0c5237ad3e0c92ef49dd4632a0c829b688e03a868adb. Chain 2 (Bitcoin): anchored in block 958163 (2026-07-15T14:38:07Z), 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/QZZ8B2348948.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x876fedcabbf1de5ac6524f052f771ffde00405b7a70e8e3b8ad5965e3d296c61. Chain 2 (Bitcoin): anchored in block 958163 (2026-07-15T14:38:07Z), 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/QZZ8B2348946.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xadd9b619ba41fe6532adc07187308f72e3b4dacedf4f717688f21deaea94ff84. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/QZZ8B2348867.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9b57def3df1f326a9383fa00aef6ba1ddffba0dbbffd2a953b95448381d64fe. Chain 2 (Bitcoin): anchored in block 957754 (2026-07-12T21:26:22Z), 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/QZZ8B2348870.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa5e9a9d49c8424c2c5ef93ddef0e61e462470328a11a60d3a2c09f002bc5dd9. Chain 2 (Bitcoin): anchored in block 958163 (2026-07-15T14:38:07Z), 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/QZZ8B2348865.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d120f69860b8b70ca330a01845b7a04278fd8b48ea59e19708acb6ba7655b54. Chain 2 (Bitcoin): anchored in block 958170 (2026-07-15T16:21:50Z), 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/QZZ8B2348947.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6519001dfe66ded5f529f262f7452b0dae8f2db989f497e6a260c3c904328dd2. Chain 2 (Bitcoin): anchored in block 958079 (2026-07-15T00:21:05Z), 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/QZZ8B2348943.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b0ed4113590111ca75e86b17e8973b2a837752eac1785730778d7b4f673f076. Chain 2 (Bitcoin): anchored in block 958170 (2026-07-15T16:21:50Z), 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/QZHN82226292.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x050eb86b9e5ceba15c03c9089d27bab8269abfb505c69722219564d35814c25e. 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/QZHN82226293.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3b703edee1f53f878f663609ef0c479f695d2c8db5c67279e22557e297690d2. Chain 2 (Bitcoin): anchored in block 956482 (2026-07-03T10:33:57Z), 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/QZHN82226291.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x787c3a413eee5034de6be1f29b7abfec0e37472bbc900040fe8043df7a41a890. Chain 2 (Bitcoin): anchored in block 958166 (2026-07-15T15:55:19Z), 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/QZHN82226650.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a0416c2a7fe8aac97d8de3e7b1547a9513f82748af4dddb237343fcf0b5c7f5. Chain 2 (Bitcoin): anchored in block 958163 (2026-07-15T14:38:07Z), 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/QZHN82226284.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f734ef9ad8fd0e6200827505e4d5bb8bb661f4c84f764c70d4657ba75f73850. Chain 2 (Bitcoin): anchored in block 958079 (2026-07-15T00:21:05Z), 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/QZHN82226282.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x304ad761fb64b728108b1ddcd97d9d83d66235c5865ffb3b3834f61249bd8cb0. Chain 2 (Bitcoin): anchored in block 958140 (2026-07-15T10:05:23Z), 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/QZHN82226301.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d259f540dd2cb03084d0a2fff74a2790081e2fc024632965d8c55df73f55f1d. Chain 2 (Bitcoin): anchored in block 958121 (2026-07-15T08:02:12Z), 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/QZHN82226289.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x810097e38c2d7ceb8caa182beb387a59b3fe19a2c176fe66059ce7d01c22f9b0. Chain 2 (Bitcoin): anchored in block 957754 (2026-07-12T21:26:22Z), 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/QZHN82226286.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc06d8963e4244532be2c671b95f900e992fa686a1c16060b91f79edbe1914fd. 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/QZHN82226298.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3e511f178940bea5ffee2221a21c9bcf89360155213a164f279667886e3a7df. Chain 2 (Bitcoin): anchored in block 958142 (2026-07-15T10:09:30Z), 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/QZHN82226294.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x626b79c432ec0681c6c1de0f0c0ecba7fb44bcf22c387e315599af74c0785242. Chain 2 (Bitcoin): anchored in block 958436 (2026-07-17T16:42:22Z), 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/QZHN82226295.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9515ded17025ed1183e49feee6129970f240acb27cb88e5383e69d20afb4e870. 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/QZHN82226283.