William Pierce Butler (born October 6, 1982) is an American multi-instrumentalist and composer. He is best known as a former member of the indie rock band Arcade Fire, with whom he recorded six studio
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 0xaf4d112ea5ac9361c77ec199bdc0191c1e444b7fb67c81e75fa5276efa745599. Chain 2 (Bitcoin): anchored in block 953423 (2026-06-12T21:20:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/5ba9c8e5-99d7-4ffa-82cc-785b7827feea.json and https://artists.proofprofile.net/proofs/artist/5ba9c8e5-99d7-4ffa-82cc-785b7827feea.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 0x5223a5bc9b812cffa87ba2b6790676a883de7fc468db5451e4378fb3acadc74d. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/USMRG1554001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa78778ca4de33277678a61fb423a42d6258d333b3c25cbdadc4634929df8f229. Chain 2 (Bitcoin): anchored in block 958917 (2026-07-20T19:56:48Z), 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/USMRG1554003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a74926bb084d31918f2b2f759ab76fbb2492c73a4a7aa172e851b03fab3f89a. 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/USMRG1554004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54d11c730046689b40273b034d1d7046651fbdc4c47a9baae5b5e890301d3a99. Chain 2 (Bitcoin): anchored in block 958140 (2026-07-15T12:33:34Z), 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/USMRG1554006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e1fea8c23f6655cb50947cbd3f5f5c87bd5e18f803e646e55ae58a6eab553ce. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/USMRG1554008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5e562642301dd5d1e71ca42eae30a82c10607a9f5b06310bb970b4839fe8395. Chain 2 (Bitcoin): anchored in block 956891 (2026-07-06T07:16:32Z), 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/USMRG2072005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70cb7766c836f57b90e044eb58218bff00c4f9cdd42664889953da8618b2f792. Chain 2 (Bitcoin): anchored in block 958955 (2026-07-21T05:10:52Z), 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/USMRG2072003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5e562642301dd5d1e71ca42eae30a82c10607a9f5b06310bb970b4839fe8395. 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/USMRG2072005.
Hard Times (Shiftee & Zak Leever's Blood Rave Remix)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaeac85b46da4363959f29cac71841724ef14c3cbf9b883f81561a628e7f5b8db. Chain 2 (Bitcoin): anchored in block 958520 (2026-07-18T08:19:09Z), 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/USMRG2272022.