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 0x86af11e6d2a6fae87ba9793b4e5f2daf98453bfe96072d27bcce8436eff674d1. 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/85f4b0a3-a9dc-45b4-a291-f42318f07259.json and https://artists.proofprofile.net/proofs/artist/85f4b0a3-a9dc-45b4-a291-f42318f07259.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 0xd5bccdf4f84c11a4409c618f8586418c4d1aec768611cf61e33fa7414fcb0bed. Chain 2 (Bitcoin): anchored in block 959015 (2026-07-21T13:52:01Z), 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/TCABB1155226.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaee2d633aeebe98b69bfd273af78dfde56fcfff3c67e02d26ff7dad609f65d39. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/TCABB1155228.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa804bbe719a7d447cb7e09fafdc6f47979937314175350d9fbcfc87385b7330b. 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/TCABB1155235.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd77e76f9a1a828025a1f5afc96e5d371bf99f9f7322d21ce544f283a5fab3fbf. 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/TCABB1155236.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe931ccd6c5b5909c5592a0ce44c0ce5f56e8d9850376b951c27e0a176f2bfad6. 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/TCABB1155239.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2a5cd0f24a9ce173cf6abb5c7b91c7dc10c1efba56290d43fc5352dd99e12da. 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/TCABB1155603.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc5f42497380793f8497451731ff907a766b4d652142e3725314e2db4e5c615b. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/TCABB1155607.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f4f95173d977d0ee2829512f408acb9bdd07647178bb2533281dbddf29e751d. Chain 2 (Bitcoin): anchored in block 959008 (2026-07-21T13:14:05Z), 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/TCABB1155576.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb76c05ea393c3f0233cdf03bbad0bf27bc5b7b95bb8b647d4dbf491968bce42. Chain 2 (Bitcoin): anchored in block 956396 (2026-07-02T21:01:51Z), 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/TCABB1155577.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f8bb1448c8ff0eed345645df3f53fbb3685a4394441ea002b80518df1f9754b. 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/TCABB1155580.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c5f82a3a4d37ff1b4db2ac97dc86c16e76629a0a341d51f845ad11634fb542d. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/TCABB1155582.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46bc1f8fbdfaf0ef1dbcfd0c546f4e361ba094bd8e6251ffaedacb3e5959d1a4. 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/TCABB1155584.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa004abb76837e356aa7c18f27830754187cecddd5466ee60c92029d514e8b04a. 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/TCABB1155587.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x632bb271aa8c36018af3b1a5356434ac206d009c2968819a1beba6684a562c0c. Chain 2 (Bitcoin): anchored in block 958271 (2026-07-16T09:16:54Z), 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/TCABB1155589.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2fcc259bddcdf5397d8c7b2775e36403e0b66324a108d9dba78055fb46f2d14e. 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/TCABB1155641.
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