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 0x46c9d243519a74a454bbff28688e9f25581d7009e3e89206e105a99c9c6a2113. Chain 2 (Bitcoin): anchored in block 953678 (2026-06-14T19:23:11Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/630e0284-146a-4e8f-9a1f-b7849d2672ab.json and https://artists.proofprofile.net/proofs/artist/630e0284-146a-4e8f-9a1f-b7849d2672ab.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 0xa40140b5edf588c41ea5d209ccd9a8833f5ac1a38f2a7f6fbfd3188f4b8f6471. Chain 2 (Bitcoin): anchored in block 958268 (2026-07-16T08:56:51Z), 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/JPZ922305619.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25b798b695b53dee219f4310d7f02356b4003a3b7a95e4949bb160f527fa457c. Chain 2 (Bitcoin): anchored in block 958594 (2026-07-18T18:05:01Z), 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/JPZ922305620.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff12aabf37c335ff1cbd27424f01e174a6d9650e79c4c230a09bbb9e6e538ad5. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/JPZ922305621.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9feef297cc7b50f5a1dca792ab8bf2ae5a37d4d445b373a03e1f1000b2f467b. Chain 2 (Bitcoin): anchored in block 958733 (2026-07-19T12:51:21Z), 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/JPZ922305622.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb46e151505365fac1de223998e3567c69caaa3a59ab403592c07e27beef16e2d. 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/JPZ922310044.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa87ed14e0b5c6199d9be2bad01bc98fd0b68b04df52ddf82d7e8b4f71c97ef47. Chain 2 (Bitcoin): anchored in block 958959 (2026-07-21T03:51:22Z), 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/JPZ922310985.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55d67b8a4bab0eca130c5636ab33b5094bb63dcad2c1ef2699b6a2687b4f5db2. 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/JPZ922310986.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70feda9a6a307a51b83b0ad12c3da7ca55956849c6f70c4b51a0cd29c9c9f1f7. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/JPZ922310987.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xabd720eb85576134227253aee5206ab46c4e16fa3fa29bf3af1506c89d90ee1e. Chain 2 (Bitcoin): anchored in block 958736 (2026-07-19T13:04:09Z), 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/JPZ922403958.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec0bc0d42995739f25d8fd1cc7d9428f59b905a1f114703758806f1af8cd2231. 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/JPZ922407926.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04ad8497c6e5220995d36bf7a5b4724e12d95b1900c87c5d5c1103b86477faa8. Chain 2 (Bitcoin): anchored in block 958561 (2026-07-18T14:22:01Z), 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/JPZ922407927.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c2ffc5125395489f38e8c1abed9a218a3c5ea2ac374003c53dfbaa90babd6f8. Chain 2 (Bitcoin): anchored in block 958489 (2026-07-18T04:13:26Z), 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/JPZ922407928.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7dee9b955a543e904e71291ca97161b7d2ac933d8bef7f2372d17cc7fa9835a4. Chain 2 (Bitcoin): anchored in block 958792 (2026-07-19T22:55:52Z), 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/JPZ922407929.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7de60f60b3e8f23b4a95258d054b8546745267086306d4c0c551f8a1a0fcfe7. Chain 2 (Bitcoin): anchored in block 958783 (2026-07-19T21:20:45Z), 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/JPZ922503210.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0faa78c8d8452fb75c129d58ca86e4e1cd9d1815aa74bcdd2b671dc361fed9a8. Chain 2 (Bitcoin): anchored in block 958830 (2026-07-20T05:30:12Z), 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/JPZ922503212.