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 0x31400e684853d8748af07618b342249a50f5762aa1060bd3e771f7cc8d270e53. 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/72202b16-53a2-4236-a75e-598ba469a8a2.json and https://artists.proofprofile.net/proofs/artist/72202b16-53a2-4236-a75e-598ba469a8a2.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 0x7d71f8279ca2105671400e076ea60839e4cbaf5a3bfb1747b1b669c2ced4e6f3. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/US4HB2100348.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0693972f3831bfdcb512cb24b80e4747bad2d3fe27f79167faeb7fa05462a75. Chain 2 (Bitcoin): anchored in block 958468 (2026-07-18T00:27:51Z), 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/US4HB2100329.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf87f368b8fd24e34358aee9ffd92c401d4710540865da10cfe54af7056d56452. 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/QZMEN2055440.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d71f8279ca2105671400e076ea60839e4cbaf5a3bfb1747b1b669c2ced4e6f3. Chain 2 (Bitcoin): anchored in block 958918 (2026-07-20T17:58:04Z), 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/US4HB2100348.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0693972f3831bfdcb512cb24b80e4747bad2d3fe27f79167faeb7fa05462a75. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/US4HB2100329.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5820a9b6c4cb358e061e80259dcd6860a727131762cb3598364a336a6ffdc4e9. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/US4HB2100351.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7cda31c7e827b95153cefa0da660315bceb196f67758c884405d07191909350c. Chain 2 (Bitcoin): anchored in block 958650 (2026-07-19T03:36:41Z), 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/US4HB2100349.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd27217fb449f5955cbe3cce4d90ee3fa14a44ad43886cbcc37e4986a0a9227d4. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/US4HB2100352.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x844834eb0fe11a830ab4d3c075b1c594dcd0a538d3c101d4a4e58ccdbc9f60ca. 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/US4HB2200526.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64bc2955c225fd1a8d0d08db8b0a887231f5872113b8b51cd47b664489b26132. Chain 2 (Bitcoin): anchored in block 956728 (2026-07-05T01:43:49Z), 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/US4HB2200455.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf9e9774c779b327351867bb434f649a4716b28090d4850c93facfb9098d297e. Chain 2 (Bitcoin): anchored in block 958752 (2026-07-19T16:00:28Z), 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/US4HB2200489.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xecb4973d0017f6bb6f058f4b7b5dfceb84f0008569c5a6e68689d1162b818920. Chain 2 (Bitcoin): anchored in block 958662 (2026-07-19T04:43:15Z), 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/US4HB2200546.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb9ce342f98e30f43345b7df0d3d15e8a256035e82da1b64d55af83d80e7d414. Chain 2 (Bitcoin): anchored in block 958996 (2026-07-21T10:57:35Z), 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/US4HB2200547.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8fdf478095216538dd7a6fb3e2c400a965cd6142ec674475785e630856b18601. Chain 2 (Bitcoin): anchored in block 958969 (2026-07-21T04:58:13Z), 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/US4HB2200497.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9488105b72cea1d31df675a14c0d0b3aee7ff2374604a5addbb6ab86a0300bf6. Chain 2 (Bitcoin): anchored in block 959087 (2026-07-22T02:05:55Z), 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/US4HB2400033.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a30996f49d9fd9073101b69ad45b6e26070a9ded408af9d3cc811cb638ff9bb. 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/US4HB2300174.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac82f16256b287b0388ac2f25b2ef11ae507bfa659424ee1e0af490b661f773c. Chain 2 (Bitcoin): anchored in block 958650 (2026-07-19T03:36:41Z), 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/US4HB2400024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x854ce9249d5320ccf13e0230a6b171bf6dc831449a4cc4a7c85a342c6aa659ba. Chain 2 (Bitcoin): anchored in block 958897 (2026-07-20T14:57:46Z), 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/US4HB2400035.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x434a0eee1867cd5c8ac42d27d4be169d6e6c2e8eb8816e757aaa605c91e53857. Chain 2 (Bitcoin): anchored in block 958473 (2026-07-18T00:52:36Z), 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/US4HB2300091.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01bb685cb32cfc1e7bcefc59e37bf66bf690df33a2ce8276eb3c5e3b3918c5bf. 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/US4HB2400000.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x370129b1fbf9e3ac45cf9a8e37b55851ef5544924d9e55cfc4be4fa86e0500cf. 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/US4HB2400034.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a30996f49d9fd9073101b69ad45b6e26070a9ded408af9d3cc811cb638ff9bb. 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/US4HB2300174.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac82f16256b287b0388ac2f25b2ef11ae507bfa659424ee1e0af490b661f773c. 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/US4HB2400024.