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 0xfd8816b46455b4287d541e50611a478fb350b32a8a92cc1fe1596abb5e74b8c6. Chain 2 (Bitcoin): anchored in block 953791 (2026-06-15T13:40:30Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/df9fa2de-cb4b-476d-bec0-e6ca47a39285.json and https://artists.proofprofile.net/proofs/artist/df9fa2de-cb4b-476d-bec0-e6ca47a39285.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 0xd532f746496c2fee5be12584541c72eb54aeae6a2c1fb5fb9bb06d5494adfe37. Chain 2 (Bitcoin): anchored in block 958878 (2026-07-20T12:32:15Z), 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/ESA011722731.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x864c47394686d65fff1d48486235c9a6a8880687c83c00427959d81bf9d76974. Chain 2 (Bitcoin): anchored in block 957750 (2026-07-12T20:39:38Z), 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/ESA012140276.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc75c510f69dac40dc1f0632f0642671fd102548f08d9d2c75ed486f207e5ed7. Chain 2 (Bitcoin): anchored in block 958985 (2026-07-21T08:39:15Z), 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/ESA012140277.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8696f552780eafd1d9625aea15c5d741eee62b0094ebb82f6ec3462b5189c21d. 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/ESA012140278.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc83a0ea60de17a27ba43e10187a3ce5d832ddf69ce530444a2f5342801b30e9f. 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/ESA012140280.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ea95585b415af100f963f7991e58747022a90dda2b6090d6d51d9e614174e44. 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/ESA012140281.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb917f5e059ea373ee990c529797ba4931578316d3bdf2716e1094c70ee8c8c9. Chain 2 (Bitcoin): anchored in block 958246 (2026-07-16T05:55:09Z), 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/ESA012140282.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3deed7ee3c47972ab9412c793175ffbf6d8606d661834786a522019f19e0a997. Chain 2 (Bitcoin): anchored in block 958721 (2026-07-19T11:02:33Z), 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/ESA012140283.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b7195a4e7c3c2791eb07f41c7a6560aae06a5eebbcf18887f94c62bf2754840. 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/ESA012140284.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbcd4500857b90bd1220315c87b0550004a859b29452e41738775f85b1ad8328b. Chain 2 (Bitcoin): anchored in block 958816 (2026-07-20T03:51:05Z), 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/ESA012140285.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x659cc1bf4da90a29c97cc6e76800502e98405e29d900e461da321dd7f8450109. 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/ESA012140286.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe440d85415864660534aeb4695321bc5a57a915355e8e8720ceeba3dd70c82f3. 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/ESA012140287.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x851e41fa23e0787ada62e673d303233bc010e742d01dc55d203223439a37f041. Chain 2 (Bitcoin): anchored in block 958897 (2026-07-20T14:57:46Z), 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/ESA012140288.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd269a9c879c4bc46d69adcf9858ddff52d501fd1293d74464afcb94b9f1d7d90. 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/ESA012140289.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc2f2b492676e0bdb682b223dd55fe09aa247f70ed476b674935529a05a689e0. Chain 2 (Bitcoin): anchored in block 958401 (2026-07-17T11:10:25Z), 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/ESA012140290.