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 0x5a5c61823417138fb8ab6caa92842608536446b134f599fc7580cf2f41e52ddf. 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/9e6d98a5-3a88-4326-afc7-39476b9bcb21.json and https://artists.proofprofile.net/proofs/artist/9e6d98a5-3a88-4326-afc7-39476b9bcb21.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 0x2595cefb0c04b72b4262cc7a0ceacae52655681baaeb202c5a52bc79a5d4c8d7. Chain 2 (Bitcoin): anchored in block 958779 (2026-07-19T21:08:39Z), 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/QZWFL2359051.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa96363be9b9e73ad27eeda8d0be890adf52eda6c625ef68887dff6b1ac158f4d. 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/QZWFL2399626.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93172c4433a636890782f9316339095db0a6a2b98530c0e81f767ebf1569164f. Chain 2 (Bitcoin): anchored in block 958095 (2026-07-15T04:30:08Z), 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/QZWFL2399627.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7a49dcc4124baabb26330063eb84e1c3922a303b1e4eb996e867adefa97ba0f. 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/QZWFL2399628.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x949c53ba16e4842cf231190fd19f5de7cf2a415045a3a8965ab23896460ecc4e. 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/QZWFL2399630.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c9a1cf043c2219fe17abcffb9c70fd897cc9d20579f292f290524ce0cbe96da. Chain 2 (Bitcoin): anchored in block 958436 (2026-07-17T16:42:22Z), 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/QZWFL2399631.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfaab08e29391b4c176bc911f981da65f2213fe0fa86cd90dddc714fc94a28347. 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/QZWFL2399633.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeaca786e092430aea5d9df075018aec2880981721f75b31e504d2d6c2588a844. Chain 2 (Bitcoin): anchored in block 957770 (2026-07-12T23:17:00Z), 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/QZWFN2375612.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed3786e40691ab3ad67b883a881484f50ed6552e94f665d2a325b470cc15ede2. 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/QZWFN2374837.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0059dc098c9ec7ed8e1158e3c4f3545297f127931f23ed9c1e1e38c9b83724e2. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T13:14:32Z), 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/QZWFN2374838.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7b2cc87fa137b92684766485a4f92752920f84aa7d3ee2f690fceee5a84cff4. 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/QZWFN2374839.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf60807e6f8c33808766e50d60cfc75aff1614ec084382b77ded52a0dd66d7c2. Chain 2 (Bitcoin): anchored in block 958520 (2026-07-18T08:19:09Z), 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/QZWFN2374840.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7485c6eeee7698e5b57fa872db2365815bdf42270be7d903efd975983d44f592. 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/QZWFN2374841.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27e31b976880082c5413af15a44180308a3656cdcea68986125c8c0a278928e3. Chain 2 (Bitcoin): anchored in block 958410 (2026-07-17T12:18:07Z), 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/QZDA62537906.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d95353162fac4879a01973afd63cb54b9b39d15259cb1d114b8e2884bf5bd28. Chain 2 (Bitcoin): anchored in block 959024 (2026-07-21T15:31:18Z), 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/QZDA62537907.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf459a4be9282baf829b45f855ddcac425158b6e1d53768982bf5e24e3aad123c. 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/QZDA62537908.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8fda814cb54835b30a9fe74a4680eda423ed134f1b112ed3a7330d5d8a02fe66. 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/QZDA62537909.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa22c8395b4f194f1e607efb30033edc201e3901a52e424219d96264e7c8da9e7. Chain 2 (Bitcoin): anchored in block 958796 (2026-07-20T00:01:46Z), 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/QZDA62537910.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91ff9263e798e037d48c014b9271524b967df99e50317fe77f2f67396695f496. Chain 2 (Bitcoin): anchored in block 958110 (2026-07-15T06:57:12Z), 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/QZDA62537911.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeeb8d3344c7aef95c824b210e088d5f3db46dc33618038c2d2475ed716e94c08. Chain 2 (Bitcoin): anchored in block 958166 (2026-07-15T15:55:19Z), 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/QZZ7N2563390.