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 0xcb79bfea82a701b62d4c5a50d1cfc0e3631a9019808ac033ea7139e30127288d. 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/b4e8c908-703c-4d9f-be39-620d71411a72.json and https://artists.proofprofile.net/proofs/artist/b4e8c908-703c-4d9f-be39-620d71411a72.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 0x3c5dae16d8c11020f5f33847e6ef437d3a4c1ca60432fb6f6234d30d0bc5b5ea. 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/GB2DY2200848.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcda592157f3f33241c069a78d3d5aa613e99b262b4d1f402f1109be3d092dabf. 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/SGB502318883.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66fccbfdade05eb8d6330fc888c72c4a21c4dfe46dc748d2305236afd5935ce1. 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/USZXT2352451.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe254e53460e40a7cbfbb636a2684e69d42e8c2a405dc1a770ef820fd669bc053. 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/USZXT2352452.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba256a0ceccfc1dd54563e87e56cc369f237384ce9433aaf4506eff27d28d1b6. 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/USZXT2352453.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba2c527f09237ec092ae4da82f50db06970ad437c60759e6027b7a41ddd426fe. 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/USZXT2352463.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8073b133de43928cf8121281bb68953a7cdb05e401a6ef2816dec39d7d01fd3c. 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/USZXT2352454.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7787ffb0970973cd24de7d1e1d727f0b8c0a117e6fdd487761977f7e36e2b574. 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/USZXT2352455.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc562af2a816366ca3e377210c5d884769a1b414483887f4066925849c8b1d4b3. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/USZXT2352456.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2eb44cb758d81f9a1ba7090390a1d7eabeb805e3036e33412bfb2170d37323c. 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/USZXT2352457.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e62fbd9848e797a5f5bf8f340c8236d39e1035d79b525857b1b0edcaf0e7e17. 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/USZXT2352464.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86f228604ded2e293e1ac5866619e489d7439616af012af1b7114a7faf0c61c0. 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/USZXT2352467.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb286ebb364370f8e390e5ea8bd66bca1bbccd375e75533b319014f1aa61675e7. 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/USZXT2352458.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce9d86693b9e91e58361344266dbfc71c8cba5ffcb5758647e81ef5f6d96a89a. 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/USZXT2352461.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40404d59da62bae62dc2a4a031c6b9183bec694a805cc86c162dbdaa97fe18cf. 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/USZXT2352460.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b4a938dddcbdc9a74df06a4be57b38bacacf14ce274d6b5234010b47ae9a542. 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/USZXT2352459.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88f960b3054cd2a55cd5be060369713a59b735e89535cf889abaf7ed81d67ffc. 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/QZK6P2591417.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88f960b3054cd2a55cd5be060369713a59b735e89535cf889abaf7ed81d67ffc. 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/QZK6P2591417.