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 0x894db5f6f4255c890435da4a8140795506aa05c15e260ab24a87718bb07d750a. 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/9107a03f-e84b-43fa-b5ef-a2cb85b8b80e.json and https://artists.proofprofile.net/proofs/artist/9107a03f-e84b-43fa-b5ef-a2cb85b8b80e.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 0xda89869a38be2fe046277384df0eabe869b4eb882751bbdcef3c055f100eddf6. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T20:31:30Z), 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/DKUM71600370.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5473f5a6d8acbeced4d889ef0c983c7d35a6dba567dd3d447df5eaabd004b0b2. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/DKS381900302.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4509d482e37219cff63937aa77560f67dd9f6c73bd6e842cee4236da4ad97063. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/DKS381900104.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36e8f8c5eb5d184729c424e83b7033ed21811715620e4ef8fb82a318c4b8f5f4. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/DKS381900304.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4c0e9b6a1281ad441fc078704ead898e305da083b7e4468b2fa53105862c7de. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/DKS381900305.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f668d6d686f84b4b08ac0c10ea03b8c4013e4cdad93a676112c1cf16347237b. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/DKS381900306.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf728181e6d8760785574fd7455a7632aeaac3228189ae9ce835b6fa8d6b3d62a. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/DKS381900307.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d324ceff8113e4e4e223a7f85245a68aa9d2cfffcaefab5f5f0baa85dcbd4d2. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/DKS381900201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3bd751857e7c2d31eaf20626966468121c6bef866a4115aefa1952f36e1be551. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/DKS381900309.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x885b108e3c63263b511a5b88fd8e21cb59937c6c93bf860953cea1ed0a0c8fbc. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/DKS381900310.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e83a385e02965221a09c5b101c62dd7093eaff2c1a398edac37a55213a06d5d. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/DKS381900311.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xadb092be2a00e79014dcde59951231b31ccaedee38cc893890416e65c021adf1. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/DKS381900312.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf98ed14185b6792a78b2328ccd95e8fc2cd2cb00536d3f33e7cdc06e3509255. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/DKS381900101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4eb88dd8e58ec6dd1e5ff2260ad841f8bcefdaf8f0492c72b8ad36693fe48d35. 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/DKM302000201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7266187319440c2226d832a3f71870cd69c6ed80569e24ede927f2666d88b2aa. Chain 2 (Bitcoin): anchored in block 958234 (2026-07-16T03:46:09Z), 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/QM4TX2438948.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x687d7ceb85e16f4a110f92322aa86ead5d016f29646cadf70ec5b0fac957dc25. Chain 2 (Bitcoin): anchored in block 958166 (2026-07-15T17:47:18Z), 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/QM4TX2438987.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7efab30dcce470df7954c86a5679bdeb5d93f6c04397f68c2cd6038d020b3eaf. 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/QM4TX2439021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25940b5675b74d8ed5516f67886616dfa17b141c84bd269f591378ebb63b94ec. Chain 2 (Bitcoin): anchored in block 958234 (2026-07-16T03:46:09Z), 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/QM4TX2439028.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52a5027c1dc05a10a4a25a2e57142d321f1d5e1a10065fa9059eca3eaa3cfa0b. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/DKADG1700540.