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 0x24d9244f47a35e9c320d3187af7921e4f75fbd6a5342023a92b9bf2b13566ff0. 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/6dea2d03-8187-4ec4-852a-3cf29211193a.json and https://artists.proofprofile.net/proofs/artist/6dea2d03-8187-4ec4-852a-3cf29211193a.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 0x549dded2dc95105245569861121642e92adc2e6ff820194406a3c799e0a9991f. 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/PL50G2102668.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6010937ad9d010eb725e33f923507550c2740b16e3347d26c3f835ac95266780. Chain 2 (Bitcoin): anchored in block 958805 (2026-07-20T02:22:58Z), 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/PL50G2102669.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54dd14862ed0a6334a2738181689879ba643f01d9b5dfb7e4bd7c0a24f017da5. Chain 2 (Bitcoin): anchored in block 959134 (2026-07-22T13:34:27Z), 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/PL50G2102670.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2199c40101e72523e008b265ef4ee7359bd4e4888478c68bb3966fedd5b22264. Chain 2 (Bitcoin): anchored in block 958864 (2026-07-20T10:24:04Z), 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/PL50G2102673.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74639dd8c2207a9a9d3bb4a4267f5f092c30960324489fcd7911cd014e4095e9. Chain 2 (Bitcoin): anchored in block 958644 (2026-07-19T02:21:25Z), 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/PL50G2103181.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5761be298357d5ce80ee3e8083b8444f012fd9fbb4ca3841b150245f7be5a5b. 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/PL50G2103184.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x955ef05f71967d1255db38fdfca9f5f480672cdeace821681cd7eb554e00bf31. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/PL50G2103185.
穏やかなキャンプファイヤーの音（ループ）
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38f416fd64ed651e212800f467abda2528f7d6c637b6aed9b640b7c79ebd2599. 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/PL50G2103693.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xabf26d7849e5c2b9d50484ab04a6db0da0f9dc878623ce2f3cf408cb836cbb64. Chain 2 (Bitcoin): anchored in block 958870 (2026-07-20T11:19:23Z), 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/PL50G2103694.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ae55b2b3cd73b8841dd7f4119bfa5faf116466f4b432de3aa323bc43bbdaeeb. Chain 2 (Bitcoin): anchored in block 959061 (2026-07-21T21:34:21Z), 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/PL50G2103695.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d4ea661d5fe702dc2954164ed4eb7eef2f2e8afa6c32e9c65be681935fbe580. 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/PL50G2103182.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75dde91f3f0d1607cf8a12f2d9c74bd767fbbb1eedc868bc3f29d4026157c7e7. 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/PL50G2500009.