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 0xdd9e504930fca3a3a4d0882b41b715c87fc787349ef172fe1abdb99a3985a83d. 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/4727e7aa-a84a-4b19-a8c3-f883fa30e0e6.json and https://artists.proofprofile.net/proofs/artist/4727e7aa-a84a-4b19-a8c3-f883fa30e0e6.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 0xb969eac434574b07b04ae02e2bc0fc685a3ce707ba8f9ec6c9719cfc30a59c5c. 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/DEHT61275361.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3277e16a2a342951b82e225ec4ce42a82bc107e8ff3df90f0ff08dedf37e623. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/DEHT61475394.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a2be215f002899916835d0dd44035b67fe6515a7ae0b64731214ab4a2b680cd. Chain 2 (Bitcoin): anchored in block 958955 (2026-07-21T03:03:40Z), 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/DEHT61475395.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3333fde2de06c3cfeca02b297e185ef8d680dd2460720ebe17556f6328c1d9bd. 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/DEHT61475398.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x406bd905a61647060af2a999eab1d33df8f89b9a54e03e0e6c770080a941625c. 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/DEHT61475400.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9fb03d7beefa8cfa9ffaf0cc492b6bdf77b3a22f4889a5ad0fc91f88e900db6. 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/DEHT61475402.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3de8b09a5c2d0c964d07c14537f7d4c3a86cab89dac7f9b6c5f1a12da6f35d63. 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/DEHT61475403.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0911d69b290b1e28dc2297351dd34c6b6f4ce6a44deb84e39f5767ba5ed5df9f. 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/DEHT61475404.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a7cb02fd791c916c3a24979207d5a4a7572493c8e34f0464bbf230e603472b6. 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/NLQ4L1600110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5298afd0934b1f06d36ebdfe7ddaa80aa96a10ab7e67966b02a53a0433d1952e. Chain 2 (Bitcoin): anchored in block 958867 (2026-07-20T11:08:30Z), 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/DEG931650093.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39279d49437bd189821add32eb8fd446d29b212c9d1ee6b93705ba0543ad5774. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/DEG931650094.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda576f1a9098b89dfb3374a8cb335181f791d3186428dbd79a4663ceaaa53297. Chain 2 (Bitcoin): anchored in block 959058 (2026-07-21T21:09:36Z), 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/DEG931650095.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x600c304d186ad308319ec3243980e7bc39f9412c15d58adaead5617a6712fb5c. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/DEG931650096.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc346b06f043a9e05980e85396cde75ba64688d718ecd03d41b95127031ccb9a5. Chain 2 (Bitcoin): anchored in block 958670 (2026-07-19T05:26:23Z), 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/NLQ4L1800008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83870faeb19f19c236e0f68f03e4e2c62e70370ab16e1f31640f0df2aed25268. Chain 2 (Bitcoin): anchored in block 958924 (2026-07-20T18:54:07Z), 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/DEAE62200056.