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 0xd8933c4a5de5b4c22b4a57c999f37343855dd3b58e72ab5a38cb828202ebc6d6. 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/340eb73a-ca00-481a-b27b-cdbd134390ac.json and https://artists.proofprofile.net/proofs/artist/340eb73a-ca00-481a-b27b-cdbd134390ac.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 0xf1e6cd5d47fab2233338de25785b6ad367e202341ccde9a1d49219fbbaaf8da0. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/TCAGL2223923.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3b463b95a3df73878f5eec14cb225b1fb42dfaad492458990546723b500d912. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/QZES52483420.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a4da79799a4cb654354f57d81f95ad95a838bd6c634f2bc1ac086a98df16e9a. 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/TCACN1679934.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1aa409ec1086bd2c7825fa14a8b648ec788f9e9c6691bf65494ac69a1e08ad0. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/QZS632226496.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeddb914ed4fad8aeb34ec897eb072b25d2cd73558ca531a86ea732d4a21366c8. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QZTB62206148.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b390e6e5945e4ef610effc4ce1bc370d37a997d223529b6b015035854db8598. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/TCAGG2279342.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd68b091cb1f47088f02dd0a020db945df1f4a64f641eb3b5b444b7c9e66a5287. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/TCAEY2007235.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd26ba754bc5a50b3674893ce4d0a3676ea1525f967634d366409466aa684c689. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/TCAEY2007404.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86988a3213219dc522dcfa256374643b01c4fcb5d122997e231ba1c774fd68bd. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/TCAEF1961469.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8784b5e65916db9461e4b26b4e5c6e85e42b7d5ffec9b2c58a78997de5e94b9c. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/TCADW1877044.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x708d75f4957371cf84948611888dc0c53d36113432d5243975be71b34feb8dc4. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/QZMEN2379733.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55e039fc57cc64304a783d984ece8f66e5bdbd850cd09f4684bda97331c928db. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/TCAHC2358114.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ed4706b963c2aa1e8e16778627f9c8dc6651ffe9fd668d9d9eb75a905dd1a11. 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/TCAHA2382609.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb15e9462f6af79c44184000b30eb4c02ef2dcfc55684d3ffb6181a16fcc77f92. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/TCAHC2358128.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8a5b4523fa59e1784a7de49a0d73674477398e7b0f4fa0470c04c5f1f670768. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/TCAHA2310456.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0b4d655032186344c190586e2834bcf0c0510b77b5552dacfaa128cd49638c0. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/TCAHC2358136.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5ac54556cd9ac2489148b8a007d1fa10a7590f98d09478fc51b04d225c65a03. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/TCAHC2358138.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ed4706b963c2aa1e8e16778627f9c8dc6651ffe9fd668d9d9eb75a905dd1a11. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/TCAHA2382609.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8a5b4523fa59e1784a7de49a0d73674477398e7b0f4fa0470c04c5f1f670768. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/TCAHA2310456.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x077cc5d3973913ea22fa5f30b172e13be9faeed99939017bdac1aa374637a3fa. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/TCAGF2265861.