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 0xedb6e6474ae28be6d286e1979fa113239889ad1337e020ebe37aa6ddfde38c4c. 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/1b3ab10d-e891-4355-bed8-69587aa33a96.json and https://artists.proofprofile.net/proofs/artist/1b3ab10d-e891-4355-bed8-69587aa33a96.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 0x41db0501c7542bd44ccb826c20fe44b78227bfd13ab8abb0d9d9b0e9b89c3aff. Chain 2 (Bitcoin): anchored in block 958714 (2026-07-19T09:51:44Z), 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/FR9W10900389.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c544c374bd58105e1d0e3d0975109231480a7415b5fc777c9db64200991efda. 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/FR9W11004038.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e5fa804fb36026660ef213ca906e15645c40388467b82f93b2ac780a5510fa1. Chain 2 (Bitcoin): anchored in block 957587 (2026-07-11T16:48:26Z), 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/FR9W11214780.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2143f4707255f70e5cc80846c974523ca39c8d2c6d98d1afe96e968d8b6c706e. Chain 2 (Bitcoin): anchored in block 959137 (2026-07-22T16:52:53Z), 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/FR9W11208591.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe55ee7a8577d652bce83bdb866d3d86c2e0350234e6d32a58a3f22b46c7f2c16. 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/FR9W11400490.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2976b69c499be16e6685d553ed17f91c42064f510569517280f34b9bc125eb60. Chain 2 (Bitcoin): anchored in block 959069 (2026-07-22T01:09:55Z), 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/FR9W11106100.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeacf2a66263905ec3b1771fe62f3c99f5fed97845a6871473e594e2f2531aa2f. 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/CH6541770377.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4108c0332ad8f8dc201bba2ecbabacc6fa0d1e62af5407780f54532fa7c9b89b. Chain 2 (Bitcoin): anchored in block 958876 (2026-07-20T12:15:48Z), 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/FRE5J2300070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x501b50e3c43fb3c1d95fef7a6ef2b982effb6ae8c359f959a06f93ec48fefa51. Chain 2 (Bitcoin): anchored in block 958197 (2026-07-15T20:40:29Z), 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/FRE5J2500010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20fe98bdbc81c729dcd5403117bf711cb5aab165d07e63a26259fa25e1f262c5. 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/FRE5J2400080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91608480ed9aba4f5511210c58a48b4f84d1569f3ec9cce809ec506a807c5b6b. 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/FRE5J2500040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4fc0187dd6caa2e27ccf2e60654915a275a7583ca6bd61082263e69d82a371e7. Chain 2 (Bitcoin): anchored in block 958383 (2026-07-17T10:41:11Z), 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/FR9W12028679.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37ecd81d695da4e0581a27804d7d5b368cffc06f764995c1882605c663afbef3. Chain 2 (Bitcoin): anchored in block 958867 (2026-07-20T13:41:50Z), 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/FRE5J2500070.