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 0x55463406985520a8bb6fa4b1f2f212fbabb2cc6b39745afafd16d450899903a9. 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/c7936665-4292-4d59-b3aa-155a48069f3e.json and https://artists.proofprofile.net/proofs/artist/c7936665-4292-4d59-b3aa-155a48069f3e.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 0xcbe74d20afa0cf40ae1df9aa247f15fe4daf8eb35e805839c8787f6cf9b90c41. 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/USEP42327012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc64266ef5211338fb4760d0c43fc29881513c6693467b526aa74c2b78449379e. Chain 2 (Bitcoin): anchored in block 958342 (2026-07-17T02:44:46Z), 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/USEP42327008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8a360549bcaaa622050018d2c8f630ab121d36f5d805e763d618422c93018ed. 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/USEP42327001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb30b566bd6cbe3414b725b4b6120ff488a07ddff30789698cdc6b5f5a5bfe9f8. Chain 2 (Bitcoin): anchored in block 958611 (2026-07-18T21:24:44Z), 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/USEP42327002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc29803d8bb4d53dc8e59d8ca6a40abf33cc652abf37c164815c83eb5918f7d19. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/USEP42327003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd07975f51cedfb8cbfb0f26b21ed16199a0e612443ade5016803ebf05b9f928d. 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/USEP42327005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0008c1fb6f3315cac8ec470fb75e696a16ddf7a87d19c3dd9182f1beced6c07. 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/USA2P2315276.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ce8b3abeb2d5ca3d9756b286ef9bc2024d4caafa5ab9ab3ecda82aaf5780d7e. Chain 2 (Bitcoin): anchored in block 958211 (2026-07-15T23:24:33Z), 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/USA2P2315277.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xafb47cffd3b439cf34477aa65fee86d7c00bca9ad2b41bbad0c45fabb9d7bbc4. 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/USEP42327009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77bdff4e3c6b627a29a7d0c761cff241c194bbbac37489cdf3dc6366264acd6e. 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/USEP42327010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd69f2bfec78a4475714eff34a63304d396b56117c5fe7a3d7f025f4f5cd73a8. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/USEP42327011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcbe74d20afa0cf40ae1df9aa247f15fe4daf8eb35e805839c8787f6cf9b90c41. 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/USEP42327012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3533af8680f8a1a8300d364272ed57dd699c0954fdeec6398af9fa00986e2f6e. 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/USEP42327013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2dc4e2f187cb98dcc576dc9195afc39d31a50d78258852acd2e53c3ab05114ae. Chain 2 (Bitcoin): anchored in block 956637 (2026-07-04T10:56:23Z), 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/USEP42327014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a8b4a52550a41f607801eed469a5df4bdd1c74d471da1185c2275f33c0ce456. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QZTRX2433323.