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 0xc4955be1366ae70691902ea5bd6d1fa3fd1884b3465ef36865a67aa6d2fad597. Chain 2 (Bitcoin): anchored in block 953727 (2026-06-15T02:33:01Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/8f3beb6d-5c89-4da8-94d6-a07cf223509f.json and https://artists.proofprofile.net/proofs/artist/8f3beb6d-5c89-4da8-94d6-a07cf223509f.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 0x4d300398f587edaae3c1a8915d2ca465ef01f3a8356eb212109dd038b57a7d83. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/QZES82449942.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x961298dfff6dbebd123d56fa542a1e19242c273e3be01fcc6cb4252e444d21b8. Chain 2 (Bitcoin): anchored in block 960379 (2026-07-31T09:25:34Z), 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/QZK6N2366686.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2dffc3fec4cb18ee4bc52757fc1ba4c4d04827cdbea43669547a8d26fdaa2fcc. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QZK6N2366687.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x407369fbb4d18564e624e0dbf449eab7d257ce0c6b1bf12af540a5447072cb78. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/QZK6N2366689.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97b8fed47243a1ac4b5f659aa3bb43fa40d0a2c539bbb7b8283004977d9717b0. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QZK6H2364813.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc5b7e97bd4cacf93cc5092c5c02544c826cec4c5ccb7fe54a214b97b5c6032e. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/FR10S2445501.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb30c93445f3003ef3523e9c9d26c05ad78f0a87ba2f6fa7251a32f75303f214. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), 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/DGA0R2346655.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb30c93445f3003ef3523e9c9d26c05ad78f0a87ba2f6fa7251a32f75303f214. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/DGA0R2346655.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x375adab1958aeb79ed4a3f66211b4c3922b09f05ca132058e0eea4850c80c038. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QZTAW2488064.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4e5f0320815e5c9b25ce138f5af3e46fa0ebd77543d629eae7185729448a7db. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/QZTAT2270161.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2fa382b18bb86ccf6612906b0a30791ea78e2ee8dc044a0e30f852617cb363f0. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QZNWT2288928.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4121df3c15e1aac4cbd0cf7cb840f2458c88fc01044aa56dee91bbb37df2423f. Chain 2 (Bitcoin): anchored in block 960296 (2026-07-30T19:11:09Z), 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/QZHN62404749.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x959a955b1bd08dd3f107658ce12ec81715ad8bd1ec1fadcfccae2d80fa9e16ad. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QZHN62402579.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe48690b8fbfb17e4cf6954e6ede23d06bbcb7bb8cc2e440c7b35f2721b70ef0. Chain 2 (Bitcoin): anchored in block 957061 (2026-07-07T16:07:00Z), 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/QZHNB2434277.