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 0xb444a8906d3c2ef314fa28073772f7d5d349a20b3f2bcbc7270c7380df09cbbe. 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/d9eb9f2d-acad-480e-a28a-adf7c9d1d98f.json and https://artists.proofprofile.net/proofs/artist/d9eb9f2d-acad-480e-a28a-adf7c9d1d98f.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 0x188fd11b33cfa33373e9104a6298e573797d66e238d0fbeab724ce2b78e5d2e9. Chain 2 (Bitcoin): anchored in block 959118 (2026-07-22T10:01:58Z), 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/DEQ021808714.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b7cf385e96f4945ddd4167f6fd27aea4f13b7143f415446d6e3c260220fb1f6. 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/DEQ022113228.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19a055adcc89c9b1d34fd66dc0d00731d81a2680443112659fc96b2a4aefa3a4. Chain 2 (Bitcoin): anchored in block 956482 (2026-07-03T10:33:57Z), 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/US3DF2189094.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5af1c18486cccb670b68fb19a45cae615c5295c883070c7e8661b78cecdd0e0. 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/DEQ022260531.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf41610c16a0b587bc05f2ee8bb9c0fd9c868534b6466163e741e620124631d4. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/DEQ022260532.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd37178e451fc02e25ef552dbbd97e67dd9e961f8f20af0aff44bda1578a6874f. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/DEQ022260534.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4880e67755428dbad009340a32c4d6b948c2fe9d919e0191efc2d297ba36dc00. 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/DEQ022260535.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c913c13bef6e47e31ede427fecfc15d358e97588214032a00dc5c0838db10bc. Chain 2 (Bitcoin): anchored in block 958607 (2026-07-18T21:01:11Z), 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/DEQ022292036.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a6f478d00499f33e36254c14fb0bd68448a3780cf2dd6f206cc76e3976ce0d4. 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/CH7812343662.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91c8099415c3538a24ea3eaece654ee5af92c643e09ac441c001b2c172fbdde8. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/USANG2294981.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8352532baa8f4df148a39be57464feb212d08e4c16d2a092d180444a7ab9cf3d. Chain 2 (Bitcoin): anchored in block 958607 (2026-07-18T21:01:11Z), 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/CH7812402297.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92edb1279ed3ed48c3717d27584993285d2f4121d72e23bb7ddc071cd716ce81. 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/FRX282460200.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9bcd58c4bdd1ea549f490820019473d9f597931beb3c5e3b18b79e8ce66c1a3. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/CH7812408463.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x005ec6286f816f864cf44a2cb955123f8697111b87aff9b42dd54464606b84e8. Chain 2 (Bitcoin): anchored in block 958839 (2026-07-20T07:01:59Z), 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/US3DF2489516.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31ecf36575f72c7729a7af4affbde050a16c2b37a9a25b69fdcba09208c465a4. 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/DGA0M2492746.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98e751d18c98154c48d6c2e3c913788668f392ebda9ced840bbbcfd3fab68e5c. 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/DGA0P2464913.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1027c354d9666e37d22fafcada1a91d710ab2f3ecc2d70c6c43c92a6ddbd395. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/US3DF2535883.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34a47c6d7e4c9266d337241ebc3fd513534b580302e1fac6237d7fc794a85121. Chain 2 (Bitcoin): anchored in block 960179 (2026-07-30T00:39:11Z), 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/US3DF2466943.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f03a498433987e7936c84363e6542dc9c3d98d21e8f3bdd12cbc6e3aa1c5b2f. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/QZFYW2011874.