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 0x1157569b74a7ac2e33a2cd627dee3f0a808530bd25abaff21e333aa4f7608aa7. 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/13d23082-c740-4f02-9305-9977ac8bac02.json and https://artists.proofprofile.net/proofs/artist/13d23082-c740-4f02-9305-9977ac8bac02.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
この音とまれ!～時瀬高等学校箏曲部～
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 0x5ccd7cecb78e27b55cce785481212ba02d133028bfd52494814d63e7a202f2a9. 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/JPKI01710769.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x664c09ac65ab25d0dbe4307604fb450ebd82bfef9736ffc0a1d8549300179c15. 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/JPKI01710863.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6bc623aab58f0517b5d1a0c887c56d1be17bcc8d329736d879237ffac39c2463. 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/JPKI01710775.
さくらさくら～十三絃三重奏のための～
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4743f33af30422eeeafd3b2150f1f99549128fa7fd22a4a15a6dc1b40014ee27. 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/JPKI01710774.
虚龍譚～独奏十三絃箏と箏三重奏のための～
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0e0dbbfa9ae9f3bed8c9aa0d0482e8c41b45227264aa604ddda8127be8f98d0. 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/JPKI01710864.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c958f3ded63df48036bf89ef43c6f578c0c55b65c27358485ea381aba6a6760. 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/JPKI01710773.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6fbd9d2c89c0378acdf6d3bae48f903f2c37e1bf175edad26dd27cc4fc08542. 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/JPKI01710771.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x008e12bc03c98fecb289a64a35cc78afc358e398e2f4cb57e26dc9b7c4860613. 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/JPKI01710865.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbfe931ca8068ac481b48714bbd26c768cecaa6ca0ab53e5696bd699270203b2b. 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/JPKI01710866.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda5923ab9a15f5816863ab4e4ebb809e684141782023f5dd83a4524c4553ba0e. 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/JPKI01710867.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x020beb285e1975236c39f91e89b22be50e785bce6fb746d316edc2a74a9b98bf. 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/JPKI01710772.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9852ca9b866e561600a80ee32012765eee8bfea9e01bfc1417154ad972abe15f. 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/JPKI01710770.