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 0x30cb2779d216bd1c196c088b0e27a6e31d9e612c4f8cdf39e68b5758236d8f7f. Chain 2 (Bitcoin): anchored in block 953786 (2026-06-15T12:56:12Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/d86e3a32-8846-450f-bcc8-1b5d28b47510.json and https://artists.proofprofile.net/proofs/artist/d86e3a32-8846-450f-bcc8-1b5d28b47510.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 0x27ee65d1a358f52987b76485674a5fec01b82cf8a8b700ff73916ff0c6c1cacf. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/QZK6P2220936.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4bb870e9b805efc941b33a133a9f32a9ff9f04e63a6c63c28eb569ca6551658f. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T02:01:41Z), 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/QZRP52230750.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77f57993c277b857c8fa0111202738f608329946fd62b4cfa72d7de756042c39. 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/QZK6L2497935.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8cfcb565c14cfe4f77e6d65d261836626bdaa65be25a8554e262f4e155650bf. 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/QZNWY2443735.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd63189c7eea0abb660e8488cdf1f1892a170d7635b42e63250fdc482c79e6f96. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/QZTAZ2423904.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66b692aee96361fa8919090870b90097f4452222f37420699ad3620a8893819f. 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/QZTAZ2423905.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x052b0242465a4db1f60f6190949cb9a2d69bd15bcb075ce19be8ca91a15cc155. Chain 2 (Bitcoin): anchored in block 958552 (2026-07-18T13:15:29Z), 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/QZTAZ2423906.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52ff15fe0144b16b9f011ebe976d23bb7c420a8c78d141b5bb51872708ac2db8. 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/QZDA52559792.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x94a5726c410d30f14d3498714828fe547e8544a7c478d05ac5c42d3b21db6fcf. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/QZDA52559793.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfcc6cedac1329f418adb28f196a9688aa2ff2fc4093f05de0420db57b905e856. Chain 2 (Bitcoin): anchored in block 958947 (2026-07-21T00:53:33Z), 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/QZDA52559796.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfba7e76002d311a00582ac8ae6d3703177d96aaf43137aad17b9b25b2b288e9b. Chain 2 (Bitcoin): anchored in block 958690 (2026-07-19T07:14:39Z), 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/QZHN82560722.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5526ca0c067734308640fb063d2ec693bc17aa7c24ce5e23a9da487de88e0f54. Chain 2 (Bitcoin): anchored in block 959107 (2026-07-22T07:19:23Z), 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/QZHNB2552544.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2ad9660820cbe664d3291bd449714bec9efe847ecac043c7aaea1b45a808440. Chain 2 (Bitcoin): anchored in block 958800 (2026-07-20T00:52:19Z), 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/QZNWX2597066.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f69ffe874ae30b8e8552bb200bfa1135bc768e184f0e072ec1c46465d09a6c1. 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/QZTB52549789.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44b88f8387313b70c1c15adb5fa5e9d4662e714c0c2a7ec5ffddea6a31d90b70. 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/QZWFU2502206.