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 0x539a1423ac7efec14065b098fb7458547d0ecaed325f40d3611b09ace83bf116. 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/2d51ce19-cd99-4aa7-9658-f96077221f19.json and https://artists.proofprofile.net/proofs/artist/2d51ce19-cd99-4aa7-9658-f96077221f19.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 0x260f740eeac340af8de86aac55734ea80d82249b30cbc42ca342eb1c0a0aabd2. Chain 2 (Bitcoin): anchored in block 957680 (2026-07-12T09:07:22Z), 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/TCADS1805050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7c63becd306d446d41322e9de0fe850db2aab08bf6c4f6eb057ff62207c15e4. 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/TCADZ1885134.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28ecee0b8e5e7c4bcd39225aa4c7bd510d4aacd5ee7bbd4de41cbd76b64275ef. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/TCAEJ1964737.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c60aa8cc0d20f54d8e9be0365703f28292f162ce4dcf0229b0d60f0daaa725d. Chain 2 (Bitcoin): anchored in block 958596 (2026-07-18T18:42:38Z), 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/TCAEJ1964738.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd31891484abfbd733bd892854d58ee1c0896b802b10855b7974c222b81bf3dcb. Chain 2 (Bitcoin): anchored in block 958074 (2026-07-14T22:45:25Z), 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/TCAEJ1964744.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7470cb10aa9f975a4daeb03d8a05763a323637712475cb6f69967e9b5bdeb7f. Chain 2 (Bitcoin): anchored in block 957747 (2026-07-12T19:35:06Z), 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/TCAEJ1964758.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3eb20688a55ac28e59c6d280d6d598da5102c51891910de1a3d878f6484b7ca0. 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/TCAFB2030255.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2491317ef27fa18c0bf67829101d514d9888af6d4ec5e9470e2e4aca79d95d05. 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/TCAFQ2176209.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa857855f47d49e42e70a1cef7ef0b6b0627df75fb3b73004fba5dbac118a451e. Chain 2 (Bitcoin): anchored in block 956402 (2026-07-02T22:05:07Z), 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/TCAGY2303512.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02d7d37257b1fb8c5e56839f1a4f8761fb71abedfdfe2a6373c7c02e8546360d. 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/TCAIP2442666.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc65970c47f412681b486823a2f79baabc4e585af3c8c4c1201a927ad6a562442. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/TCAIZ2434339.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54f0ea34282210d6348590e74632ef7fdfce5b14472197ceef11eccc76bb4a91. 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/TCAJG2599347.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc49476690e931b2b0660fc57a74c617a182b7499a14c473d45cfefd2f647a3b. Chain 2 (Bitcoin): anchored in block 958812 (2026-07-20T03:24:09Z), 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/TCAJG2599696.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x300f4dcb6c4faa13b2558fff72f9d48ec0d3472c2637431b3a6bf6f730a5c3ac. 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/TCAJG2599962.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x797c573d035da166b71028a03d81f0461295c188632e48bfbab475d7bb26a90b. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T05:29:55Z), 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/TCAJH2500492.