Loose Fur was an American rock supergroup comprising Wilco members Jeff Tweedy and Glenn Kotche, along with Wilco collaborator and Sonic Youth multi-instrumentalist Jim O'Rourke. The trio first conven
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 0xff8bd2b59664d524dba5296256ff4839e552762d9ee66749c2d5412f54522d2c. 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/198b5f96-2f9d-4d64-89e6-04a01bf2024d.json and https://artists.proofprofile.net/proofs/artist/198b5f96-2f9d-4d64-89e6-04a01bf2024d.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 0x97ca2de4a1f5aa0a11aa08fdcde54866cc953331c407614f08e0744e8b1ae0a7. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/US58L0520302.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x08e481fa5bd40da5b73f398aac2de83bec9215dc8d2f3aaa62c771a247b37278. Chain 2 (Bitcoin): anchored in block 958817 (2026-07-20T03:52:09Z), 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/US58L0520303.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc15aba5ab2fcb0904979888426647a3b25c9bb042d6d1c595852cf4ee5247df6. 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/US58L0520305.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4641edc0f9ff630bbd7ee0a853959ee5da7eab341f3134994e8bb9dbf1601c92. Chain 2 (Bitcoin): anchored in block 958256 (2026-07-16T07:22:18Z), 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/US58L0630903.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc62b6af67457d4b82b730eea2d33863603d5c9bd80af53eb8bc30c732baa329d. Chain 2 (Bitcoin): anchored in block 959355 (2026-07-24T03:24:16Z), 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/US58L0630904.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2589e01b7baf26363e2d8957c69c8af9768d865ff67b4de1c629c260bd98b42. 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/US58L0630905.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x948f2731d671a48d6e39cb9dc2b2997e9b053875b32fd48f2bd23580997a85a5. 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/US58L0630906.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0c5ec1c0bb6b4c263bc6359670a1022ec346bb031f421b70c6b48c3c06da40c. 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/US58L0630907.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93faa57df19d8d956f9dbbb484be1d44016d9287635bb1b222b39fd2d2406e58. 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/US58L0630908.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6c915f27accd89a46f09aab424406ca7f920c99c2d0702729bb3846bda958d9. 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/US58L0630909.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4698c4600556362ac59dd6a86a5b3d90bf252c4239ebf63b3ed4df7a2089f232. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/US58L0630910.