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 0x9bea123490e8e8583cf88680cb7c4d6b65ffb188010dbd42e96a47528dc674af. 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/8d5b6482-ede8-48a5-9bb4-560965fbb24f.json and https://artists.proofprofile.net/proofs/artist/8d5b6482-ede8-48a5-9bb4-560965fbb24f.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 0xdce990ba0f9483053414c455ba9ba6e2b70f5a26bb04f58f77dba0ea0e73c5e2. 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/QZFZ22057869.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x229ac9b49bc6557c7be3f534bd79e2586aa16c505f2f936d86b0195fe595d7af. Chain 2 (Bitcoin): anchored in block 958176 (2026-07-15T17:14:36Z), 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/QZES52158168.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb18a9a2781915fe37ade24efd4cd40f05c77d01de5b9b0111ee74ff65727ac7f. Chain 2 (Bitcoin): anchored in block 958602 (2026-07-18T19:28:16Z), 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/QZHNC2101787.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a6f947f5c9cc9a7e349eb97044dd106b1d7a025ebbf4868a78f006bbeb6fe17. 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/QZHN52239259.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86589c862f0a913611a8e2ce0de22600caf4cf6f36f2ef4e06aad4297059dd64. Chain 2 (Bitcoin): anchored in block 958908 (2026-07-20T16:28:12Z), 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/QZTAS2202993.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13499f7a53f1f45349ef46f0142334d8e544647a071abd51eb00e2c7e2172446. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T15:22:58Z), 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/QZTB52389963.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde1860de18485e193604c7ac70197e24be2fefbc91977dc3a6d427e3c87c76b8. 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/QZTB52389969.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7b02582b2f8de5e5a3268f0744a63684626753461005343f7fd9bd3df4e9aa0. Chain 2 (Bitcoin): anchored in block 958362 (2026-07-17T04:32:48Z), 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/QZTB52389979.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b1d18ef40b5e90f8eee9a95107797af2125862bb8dc412fd1170500f77acd91. Chain 2 (Bitcoin): anchored in block 958517 (2026-07-18T07:54:29Z), 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/QZWFQ2303416.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b21ef4ba3ce429edfa9f4a82cf812c895789d205702b6e26a190b9f5ad93178. 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/QZDA72495975.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec4aec42d8fa40df10728b8dabeb61c06101bd4d9d8125a94031988f10a420ae. 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/QZRP42462314.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x82eba963583e56a3b49e10611ccb9ecb7c460ea51cb0fe0e15157ce1e87de057. 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/QZNWQ2558827.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x386ddc84d2d38052f7a1b2ac3b8b9f43c1bcd33a15fc546db8807c03782ad77c. 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/QT3FA2574536.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18adbfbc92e161737bfac4d297273882f54e13d378dbb5b3e33504e74fb29ea0. Chain 2 (Bitcoin): anchored in block 959163 (2026-07-22T18:47:29Z), 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/QT3FG2533310.