Metafive was a Japanese band that consisted of Yukihiro Takahashi, Keigo Oyamada, Yoshinori Sunahara, Towa Tei, Tomohiko Gondo, and Leo Imai. History Yukihiro Takahashi originally assembled Keigo Oya
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30de74489e41db5641eb820ccab726b9fc6ccb5ffa76166b22b25b68a94c884c. Chain 2 (Bitcoin): anchored in block 953408 (2026-06-12T19:28:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/dab98f43-ef81-4274-b0db-d4aa0d58e0f8.json and https://artists.proofprofile.net/proofs/artist/dab98f43-ef81-4274-b0db-d4aa0d58e0f8.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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7930e19a7fccee4a6f04ce301b632dfd276a062b29827b2a4b47ea50a327da78. 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/JPWP01571817.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29f171288c10b6fd3e7663bcb9b9956b7b00bfb6dfdad169ddf72dae04252d76. 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/JPWP01571821.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2dc215fea504c207de5369933adb6af5c53541c530b26fed7c454a61bddb19b9. Chain 2 (Bitcoin): anchored in block 958211 (2026-07-15T23:24:33Z), 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/JPWP01571822.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ae67312514882283adbfcd3ac39a0aa62da1673d53b92aac86edf242288cbc9. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/JPWP01571825.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b10333d34c9e2a1dc3dc8cd1f7e7fbed4216a56c42d7b0163c140e37b3301f1. 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/JPWP01671537.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x832d119cdc72a993b38b463005d69ee6f9c9dd6a38e5e15b9b9fd63657444241. 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/JPWP01671538.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e2b072acfb90b2f686f12d0a23eb1efb1af9b353bae9cadf3046ae3166255ae. Chain 2 (Bitcoin): anchored in block 956841 (2026-07-05T22:14:35Z), 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/JPWP01671541.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2b6037a09c51099cbe0e6b0d2f6106fabe71a0b274dc0084288c47b616da5d9. 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/JPWP02000471.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02df4f281cfcba8aeb5e32b2d01138aebaff510c7168b94fa94218bbfbf1da57. Chain 2 (Bitcoin): anchored in block 958690 (2026-07-19T07:14:39Z), 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/JPWP02170340.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2e9e6e26238f2db43206311cee263371048ff4a0112c6c2f029cd8155e286dc. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/JPWP02170341.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f654c404b1418be558beeb2683a1ce05d8a6d9e94e02a6d32e299bf072b5b07. Chain 2 (Bitcoin): anchored in block 958935 (2026-07-20T22:08:19Z), 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/JPWP02170343.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa39ea934364be68557866e036ce25dc0e0a99b6471ae68ac7093bc134dd31d8. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/JPWP02170345.