RAG FAIR (ラグフェアー Ragu Feā) is a Japanese male a cappella group. Its current members include Reo Tsuchiya, Yosuke Hikichi, Kenichi Arai, and Yoshiyuki Kato. Former members include Takamasa Kano and Mas
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 0x0711b6e8e88f261ceaacb7ccf305a977e07b35e8f73ff8478c90225280af2f31. 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/a1e9ec2c-54d6-4083-85e5-4040a1848514.json and https://artists.proofprofile.net/proofs/artist/a1e9ec2c-54d6-4083-85e5-4040a1848514.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 0xef2ac7929ca25603c84e57ac93e573e13e228198dc7e783e04d58c0c19036191. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/JPTF00114802.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32a1075b923806577612ddc89b11b447012c70727f01d2938565babb8b46c94f. 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/JPTF00114810.
ラブラブなカップル フリフリでチュー
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0b69619d01c48ec4fd288133c0dd26d63bc251366573dcd142f2a3b1bfa0748. 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/JPTF00202901.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c692ae178af0105472d613e1121ea99982e482d83156586ac311aa744649426. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/JPTF00115301.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x843f898d4d6b41d30510bc474e6335df791de50bd3e43c8b1e7f868e148b3853. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/JPTF00203001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xecfe4ad4dbd696c59829b46b8675e9c078d14d4d174cb5123cc6e20ffbec1d09. 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/JPTF00206401.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2cc7af7d0828ecfb4d35b873cc42aaf95bece20ffb21c87b1e461c74a9178bb9. 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/JPTF00203002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a46ed5665a4b55fe09d8eca4d647e91651456400cb6e5a4cd56d26c21497488. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/JPTF00209001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0dddafee9c121dcf95826e4e15cb9cf6e86df528d8ddcc536571ab3fedf62b50. Chain 2 (Bitcoin): anchored in block 959094 (2026-07-22T03:33:16Z), 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/JPTF00309001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c798aa2f03f11353c92a2a921147451b3d88c4c75fa1f85b7c622daf47d62e0. Chain 2 (Bitcoin): anchored in block 958489 (2026-07-18T04:13:26Z), 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/JPTF00407002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5ab10c25eeb66da7245e978401b80610eaa2f03db1351f577b08b36daa1d0d0. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/JPTF00404601.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e9083898fa5090f36d110fef0e6a54220cba1269babe76718fca81a7e23137e. Chain 2 (Bitcoin): anchored in block 958576 (2026-07-18T16:22:28Z), 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/JPTF00602101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf366bb383bdf029cbc2fa5dada6ff26cce1fa8dcfefa079ffc0b4b28328daf2. 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/JPTF00701801.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6e71a03ec9927ca0c42c6b7b10b946dff6af3b1de3288c5d54b0370b1f34d7a. 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/JPTF00903001.