was a Japanese composer, violinist and artist associated with the Fluxus movement. Early life Kosugi was born in Tokyo in 1938, and studied musicology at the Tokyo University of the Arts, graduatin
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 0x8044861a72ca612f3b605382497beb73f0ec0bb0dff4fe7f4c4b3858e4f137ef. Chain 2 (Bitcoin): anchored in block 954693 (2026-06-21T11:50:32Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/ea551811-9660-4f32-955e-fa569337e351.json and https://artists.proofprofile.net/proofs/artist/ea551811-9660-4f32-955e-fa569337e351.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
David Tudor: Rainforest (Versions 1 & 4)
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 0xc6b3a864dd8cff3ebc1cc694f105caef2d787023c37ab6f87b46a4cf221006d4. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/US4BP9806402.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ef4e569f19bbc1ce94dd5fe8c214bd54fc925b6303647d1b20af474d49c9604. Chain 2 (Bitcoin): anchored in block 960236 (2026-07-30T09:37:10Z), 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/US4BP9806401.
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 0xe6a239542eeed12af84793eb6968feaaa1bbc9252331d380bf87de59c8937f66. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/CYRLD1500626.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e72473c19f11fcfbbc28a7b96b8572844f864cec135a9cd002317409756e15d. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/CYRLD1500627.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2ab8de0b27bb3737c9bc872f073c6dda34b7b072ba743302ebcf0ad250e7301. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/US6450490018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69803384d75582b7a326edd3aa3a66f4a8431c28409248e56261c3d3a19e2729. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/US6450490020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5128026e46df81aa424fc72337f116e1d021ab065d07b503d866224750c205c1. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/US6450490022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x687c759340f7be02648bbaf3c1625f60d5aa9040a5602f147e09cb9df48adab1. Chain 2 (Bitcoin): anchored in block 960203 (2026-07-30T03:35:13Z), 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/US6450490011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb879a6e0ba219c2e4a79279af33d046f73d46f6861ed167f5c0d5721773ce8d. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/US6450490012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x453d08e894be475ce4d12788358684850192bdb53e58957437fd2de29ee7c3a8. Chain 2 (Bitcoin): anchored in block 960302 (2026-07-30T20:09:33Z), 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/US6450490013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x444c0b4972b1682ca82aebc9e5c0c87fcb2f62e07e9b99f3f27d0bebaded3de6. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/US6450490014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74b76fd84c55cf56b18a151696a453a4ecd0f7507a8600dc1f7a9c46edc0a4e5. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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/US6450490016.
Having Never Written a Note for Percussion
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd17f015abb55ffdd5989591b64202dee5a0968965bb25fc97604c63dc9579275. Chain 2 (Bitcoin): anchored in block 960459 (2026-07-31T20:22:46Z), 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/US6450490017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc952c5f5ae8288a19107d8acff39b64dd83764f3ce1398496ec9f6b9ce3d443. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/US6450490019.
Piano Piece #13 [Carpenter's Piece) (For Nam June Paik]
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf17ad0eec47b368d25f192c05993054fe2dfb83740afd092056c535f37bf40b6. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/US6450490021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6d0d7be0822d8abc0a770775c4cfa0a65b7960d638444eb012099688b45cfc2. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/US6450490023.