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 0x76277b43ee9e924f775a6a37ba78c96bb313e0c835aa84bea71db020b0b98c7f. Chain 2 (Bitcoin): anchored in block 953697 (2026-06-14T21:49:28Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/6654bc45-326b-43d1-a034-fd76e4bbdd62.json and https://artists.proofprofile.net/proofs/artist/6654bc45-326b-43d1-a034-fd76e4bbdd62.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 0x7c6735e6c23a705e872aa9fe446fddd6b2b82f58b8f53d911c56d881e1b045d9. 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/QZNWX2415135.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x405fe85a6a03601083cd3104a78c2ffc5628340cfcbdb5dc9428758b9d12929a. Chain 2 (Bitcoin): anchored in block 956728 (2026-07-05T01:43:49Z), 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/QZNWX2415136.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa47fa54c283b47e6e4549d75541dbb08f8d9adccd052bc524d57965b5a0c8c9e. Chain 2 (Bitcoin): anchored in block 958716 (2026-07-19T10:15:55Z), 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/QZNWX2415137.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b082cde9289eeee5dbf7b0ea9440851ae3e06d381349dcff440708ae085cab5. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/QZNWX2415139.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9f852f722f533119d0790a55aa5a8d7d2adbc3fa53169d1cf5dadc7762d6841. 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/QZTAU2432076.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01e328119a5ba6bf17a2857b7d73af0491af47d94cf4ce3b42787d873d564d49. 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/QZTAU2435518.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6fad77afa18fd21db5fc53a73aa591cdc19ddbadad56c7ad6c85add2eaced2c5. 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/QZTAY2463714.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d8f2c3fcd14e791548b8beac8d0f8f1faabbd55dc35cc8571613100108b56f8. 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/QZTAY2463715.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x519f0f111d2237f13ffee441ba04512a8a0e80f79303d5e7429e946f4f2cc09b. 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/QZTB82419902.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b63eb0adf80fd8fb3d140eb9c2b5f345658d7eeec081b8c656b6837bbe66b04. Chain 2 (Bitcoin): anchored in block 958969 (2026-07-21T04:58:13Z), 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/QZTB82419903.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d27e0eb2800b06d85b5524627c79a9479de327834370939a42cc5f09b443b02. Chain 2 (Bitcoin): anchored in block 958673 (2026-07-19T05:38:28Z), 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/QZTB82419904.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e852cd998a525c7b4e29aba7a569762ccda5f4f7267a09568eb5eb4bb44456e. 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/QZTB82419905.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd4d6034e0147ff31a1329d36695a3b0694ac8b0dc4762d5c0d048981928d86e. 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/QZTB82419906.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x545a843ff234e5472a9985cf2b10cdfc7afd0d6bbd177874effcc537c68e696d. Chain 2 (Bitcoin): anchored in block 959051 (2026-07-21T19:48:03Z), 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/QZTB82419907.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4c93cd8186a737b96706a42c81e464c5569dff576cea776aaf9c18028d68a76. Chain 2 (Bitcoin): anchored in block 958917 (2026-07-20T17:53:56Z), 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/QZZ762424811.