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 0xf21002e02e5d60a943838c92b9ecb466ae3aa70e2216352b167505879197937e. 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/f777644f-0c1e-494a-b187-9285f6d7a91b.json and https://artists.proofprofile.net/proofs/artist/f777644f-0c1e-494a-b187-9285f6d7a91b.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 0xb08d684e9a4c780ad616971de7c3091b61c7874cd3767354d0fde7c4bb7a5328. Chain 2 (Bitcoin): anchored in block 957759 (2026-07-12T21:46:51Z), 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/QZK6L2107149.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x588f15669b8b831872e94e45d16605f054e3268e1326af5e96e83fe7b56d4c5f. Chain 2 (Bitcoin): anchored in block 958152 (2026-07-15T12:00:27Z), 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/QZK6J2137693.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd77a54029afa1f16e9db520f57bb6109fd32452c521dd855c5b465e5c81e3db9. Chain 2 (Bitcoin): anchored in block 958276 (2026-07-16T10:20:17Z), 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/QZK6J2137695.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc1ece0338c36b0e18832ec86b3fa4cf0b08d5c5a6d337f922a710508877a679. Chain 2 (Bitcoin): anchored in block 958228 (2026-07-16T02:46:47Z), 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/QZK6J2137696.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe811ec7314a08ab70a39eb65674dcf62eae99f090fb3d9ba8b1982de5aa8b984. Chain 2 (Bitcoin): anchored in block 958572 (2026-07-18T15:47:37Z), 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/QZK6J2137704.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xebcee1b4d6e70cd5138f5963419ed9c008a2670caea3fa11a9d6052dbfff19e4. Chain 2 (Bitcoin): anchored in block 958357 (2026-07-17T03:33:42Z), 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/QZK6K2121493.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2d5f6d8aac70c261ad98cae81fc389af05d282919422018778d2bb639910116. 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/QZK6K2121496.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7bd313c11f0bf3a53dc6e50971ab9c87037b873671162b5495a0b18fe855ad62. Chain 2 (Bitcoin): anchored in block 957759 (2026-07-12T21:46:51Z), 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/QZK6K2121497.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8fe08fa09099b1c4feb2b48d87ae227be5a2883400b91328d4e3f3ef09572844. Chain 2 (Bitcoin): anchored in block 957761 (2026-07-12T21:55:15Z), 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/QZK6K2121498.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5662376dd55f699e0bc624444ae009321cbe97ccde78e2ec7f4ebc33c9127e11. Chain 2 (Bitcoin): anchored in block 958137 (2026-07-15T09:47:57Z), 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/QZK6K2121513.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32f7b3ad3c84156a8d4d0b095baa858bfdeac50cce01ec7f652c19dcea6735e9. 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/QZK6K2121516.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf979e60f735f0e175f4edec8625de452c92f40e0bd7d923c426623c5e31e9033. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/QZTB42287929.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f3451d00cf3a5ce560bef2faba1b5317c50488c0377f0dc16506434ad8a7a73. Chain 2 (Bitcoin): anchored in block 958455 (2026-07-17T21:28:36Z), 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/QZTB42287930.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4fcde2712b2382a7119f14bb90d8b994436f1c76818ae4ab7bad901f17a4080. Chain 2 (Bitcoin): anchored in block 958428 (2026-07-17T15:15:14Z), 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/QZTB42287932.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe65591408f6c3c78150d56c82cd6536e66da36b75eb5ec8f0c696cc46d00a48a. 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/QZTB42287933.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2774a27e21d6e4abafbd6ef6962f46fe40ede7387979b1f6a469b5144170eb33. Chain 2 (Bitcoin): anchored in block 958622 (2026-07-18T22:58:55Z), 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/QZDA72390271.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xffcc1f005eab690382bd40771155ddca3528c06972817cdf5427d25934038281. Chain 2 (Bitcoin): anchored in block 958805 (2026-07-20T02:22:58Z), 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/QZHN52380588.