Ex-Easter Island Head (sometimes abbreviated as EEIH) is an English experimental music collective formed in Liverpool in 2009. Led by founding member Benjamin D. Duvall, the quartet currently include
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 0x1c16b9f9ba8591a92f8c4de8ea59f216123f8072a18b913fd5b481387aa3500b. 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/08d0fe92-33e2-4bf1-b9b0-b99ff0f3a4f9.json and https://artists.proofprofile.net/proofs/artist/08d0fe92-33e2-4bf1-b9b0-b99ff0f3a4f9.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 0x6c64f40af5221dea1bf0679fdadf23370f6b1d5fb260990b2b771df7bbf3cf6d. 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/UK2SX2405171.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e741f9a4a2993a8e39f9c0bc12f94b0812bac06dbc57f2fd0b9279fab541a22. 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/UK2SX2405172.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0e3fe15582b06d823bcfe166baa98b6b5ac74c9f04a26477c0897dee430e3d3. 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/UK2SX2405173.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13eeed0f522c21eb58aa2fff83f904cb8d546fd61712cdc9a3a9d4d9c39a8803. 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/UK2SX2405174.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x719d5ad341dc87653859f27cee51b4667398b20c15bb664f3d0acb3fc774b2a4. 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/UK2SX2405175.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1877ceeb7de1543a207f676a57bfe50e3e1751004c5959c2b3377e1d1ec68f0. 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/UK2SX2405176.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x585a40610da629878d17a363166e531243889105d6b85d6dff601e8354021e46. Chain 2 (Bitcoin): anchored in block 959137 (2026-07-22T14:03:35Z), 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/DEX261600362.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48c0554402cb501beb0a5994056ef2d29df9e34e29a8e594a47b87e96581c446. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/DEX261600363.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x397098d5a32a6c227b498242f6131652d0b49f4efae858fde1054f834610114f. Chain 2 (Bitcoin): anchored in block 959152 (2026-07-22T16:23:52Z), 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/DEX261600364.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71ff7e76a2466fc6c197d394b3259b09f8cf47443b5150bdac7e0cbb67692805. Chain 2 (Bitcoin): anchored in block 960216 (2026-07-30T06:39:12Z), 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/DEX261600365.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b1a808f1e2bbc9d85dcc3ea1e1a9bc83dc4d55318472567ab7a5f7a1f6dbe06. Chain 2 (Bitcoin): anchored in block 960153 (2026-07-29T21:57:12Z), 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/DEX261600366.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf0916c0a832e9eaf22811e9566170247f6debd30e52843058a3f9c9ec1fa259. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/DEX261600367.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4f19278ba7bd9844bf87388b66c0b698ddc1c987deacdedffe571d81950a353. Chain 2 (Bitcoin): anchored in block 960294 (2026-07-30T18:46:00Z), 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/DEX261600368.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0584292e3dff8dc03ff98c354cb713dfa19c1553a811d291a0eb481fe0121d0. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/DEX260992232.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32641194b8124bdbc7a2e171f5c2c2579a8210d1e29688188a1f45843debac64. Chain 2 (Bitcoin): anchored in block 960379 (2026-07-31T09:25:34Z), 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/DEX260992233.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b55a798fcab397c1bb43b5bb76dd0008d94013387cb3d417aebf32453d1df2f. 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/DEX260992234.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28611a9a66324299be1825338f5a60a87fbb8770aa4b9177f887b7d43d725502. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/DEX260992235.
Mallet Guitars Two / Music For Moai Hava
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71341c0115f5af4434a4b4bfb9378bcaf735a9eb5878fa5cc4b4b128b0814fc6. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/DEX260991255.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0351eba21855b42cee04bc112acdad11289d2274eceedbddb111562b363795ce. 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/DEX260991256.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ea49234f3ffb5e13409e1ebe6727142885231390a97a465efb805ac47bb7ea7. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/DEX260991257.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x600850b81506a25f9cfb8578591d1dfc2e0a207bbb4f74a757ed86f7328c2ff8. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/DEX260991258.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8ea6349d51611c1d0aeef4d971402c146f881a723bc65dd02e468461c39346e. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/DEX260991259.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ab5ef88317ef5df56a559f10d1520cac9d21d561b694f934e2b27b081544a04. Chain 2 (Bitcoin): anchored in block 957246 (2026-07-09T01:49:50Z), 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/DEX260990589.