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 0xdf1ca4caa99e6f2832c6d95b90585a6f8aa7ac4db02c7cb660fd48d5dc9c3882. 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/39e2d419-7baa-4319-8e28-cea082347453.json and https://artists.proofprofile.net/proofs/artist/39e2d419-7baa-4319-8e28-cea082347453.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 0x0f64a711f0676bba4803c47da57911682c9a4d75688f412b2e292a753ec52c53. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/TCAEH1919807.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x740b6321928bec2ba3d59a5039e1f5dffd9965af6155a4d5b41ec0c61ee771f1. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/TCAEH1919816.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x375634cb0dac9956db47fc8108dc5bdcd1afbbbb7de2d480045d50c616be2f2d. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/TCADY1891627.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f909f315d1668713ff8fed7511f41fed3e22f682b929b8b41f88099043c8ff1. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/TCADB1708448.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95e5f5105cbefd72f75c6cb8005f2ae2b5022ddb58df53b9a136f561009879c6. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/TCADJ1774475.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e12180ba2de769910127ebc9f16b94d775c5841c0e4e60537997ed77e5d2b7b. 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/TCADJ1720977.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9c2e860b2d752de42bb9fb767a1dbe6847c6b6855d8761f08ea24d5bb349e80. 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/QMDA62491842.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x236884d04efc565bb6b558acde3684becc984eb0ad1a975b0dc5d5ba9e5e6d1c. 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/QZFZ72488305.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x360ba77882c23eae2c8e2553fdaea63b0bca235ea4a07468ffd48027e668f9fd. 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/QZNWQ2354142.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe5f3f9f9b90bf70369a3938b4de7850b934db58ba761504c8136389e3b75a64. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T19:59:30Z), 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/TCAGY2355190.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56cf827d4aef6f14dc44d74db3a68a6f26162a05fafd2f3e995f5ba6f7146319. 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/TCAEM1954719.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x535320f47d0909a7ce76489054dfaba1bc719caf8371a74ec9c0c23b1d960866. 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/TCAEM1954699.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f36d0596ef5d58799b43f68d7b1fb9aed06339d89ec0f753d49cc07b102ca26. 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/TCAFB2011343.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4db1a806d2736959d2a3d617a51b2bf67c1f2093ac10d9e4a617976e4e62e218. 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/TCAFF2051613.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69ff94cd165557cd498152e84eed5dfd2855154344f959135ada54a9a7990761. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/QMEZE1847621.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x049a9904a744d42d7b425ab1c4b26089ed5c74c8dda5bb86984c4ecbabe9e4db. 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/QMEZE1723012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b370562d177851fec7de5beded4d28671d40a8c4f49467caa6f8273e030b8c0. 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/QMEZE1733527.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd66febbdab61592969bd38d4ed4feb1bfa59f0721a8072f3bd84b3db309d662d. 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/QMEZE1805934.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcad309c505753a71217e035e05f572bbe4bc8941548a4557a4e15998a1f02408. 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/QZFZ72005964.