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 0x423a93ca524fc9a303f776c117b2866ccc41994bfceb03e53978fd240ad0e5dd. 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/2f5990d6-7455-4344-a942-ab2f049e4582.json and https://artists.proofprofile.net/proofs/artist/2f5990d6-7455-4344-a942-ab2f049e4582.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
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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 0x437ed6d3fc87c4db33ef5e4fa4d03b57e33f962090a008c6c417e19c12c09636. 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/QM7281553424.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26f0297da9909e10a4a718b7647ba5e5615cdc5cc24b6e88733421863b33ab32. 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/QM7281553425.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7070c6b3c99b92f870d0c4f77d8888bdeb4bea4bdcaf5a516b1ccd6154de363. Chain 2 (Bitcoin): anchored in block 958196 (2026-07-15T20:38:50Z), 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/QM7281553428.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3afede3b7a8b4fa83c6b06cef937171a2515b17c2a87da937911660c9b4fd5e6. 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/QM7281553429.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xddd79cf5dc038d19443a23220cf75193281f9ff5af22a121eaab050fd6f723a5. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QM7281553431.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30fe5c0c8aa952e4bf626628089b6b5f4f326d7f2717d2961bac8cac4abbd1f8. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QM7281553436.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3b8b69e8b8adffb075afaea45098e92e69e546bcb5254f2a40289b11f4f2ad0. 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/QM7281553439.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92a6bc22c77f05b955cc74a28b21c614cda57515515e99cb0034541ffeb88634. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/QM7281553057.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2faf812d54cf710c80c6638e081877ddd9389849c16c1a69a7fa3489c1602b7. Chain 2 (Bitcoin): anchored in block 958234 (2026-07-16T03:46:09Z), 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/QM7281553059.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89b94d3e0a691fe00fb45cf84a5af6da55270942c659824d84d3f42d935df05f. Chain 2 (Bitcoin): anchored in block 958473 (2026-07-18T00:52:36Z), 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/QM7281553063.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4488d1640cc6734bb0efa8a08b2ed6d67e9a6905b236c29487679f9bd5e3c65. Chain 2 (Bitcoin): anchored in block 958839 (2026-07-20T07:01:59Z), 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/QM7281553066.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa0384a5880b379ff1e6ae151d2807b76f015d0c6b5674fd4ad19f740ab7a5e5. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/QM7281553068.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8fa3fcfc6efae08e996c4025ad22aac4db90e8da27c503db46ef95f9477ee297. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/QM7281553069.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f8b6652c11ac574635f21b66d50faabce2ceb2c978fa04ceb29630419f54cf6. Chain 2 (Bitcoin): anchored in block 959087 (2026-07-22T02:05:55Z), 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/QM7281552927.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b31704fd9caf0e1cc951af756d774dc16911d54106b82dbb66c321e4e8b4710. 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/QM7281549264.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b4b02f9760b3ab7b0f228e7eafff725116f46895d07e77701f575b3f13209e5. Chain 2 (Bitcoin): anchored in block 958746 (2026-07-19T15:36:35Z), 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/QM7281549268.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5838d0ec98120810d520ca0ada01783f9d3f8e2b0a6d60c26a52bfb1bc973103. Chain 2 (Bitcoin): anchored in block 959087 (2026-07-22T02:05:55Z), 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/QM7281549271.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8834665ab318a3715ade31c8a9593d39b497d8ab324164391d496309b11c84cd. 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/QM7281549276.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e42bc6ca4d0bbd996ffb11b03b7907ce04dbe81a753bf0327b634c5ccf080a5. 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/QM7281544716.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e7ed32e4eb8e21ed097edf2d7481999efdfa864e7260688d5a598763e8e03f3. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/QM7281544717.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1faf1f61f0395814f73631885fbb970f717c83a8d17babd8242995e974534a37. Chain 2 (Bitcoin): anchored in block 958468 (2026-07-18T00:27:51Z), 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/QM7281544718.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf43df98f6402e17ff6d8caa957ae0da85317718571cbe4153e43614649567f1a. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QM7281544721.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ccb47668c9c09c839da73a3e4b632a23e210efb0daf1a92b831cb1e6c44b8d5. Chain 2 (Bitcoin): anchored in block 958529 (2026-07-18T09:21:41Z), 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/QM7281544722.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9554143e05886d1faded71545173a373e0b425ab0319527ebe936640915d7a4b. 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/QM7281544726.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ade2051b88fd0212d3def0af686a4a0a467af650feff025ec38cea16535eb8b. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/QM7281544728.