Guillermo Scott Herren is an American producer who has been based in Atlanta, Barcelona, and New York City. Herren releases music under the aliases Prefuse 73, Delarosa & Asora, Ahmad Szabo, and Piano
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 0x5d5f2fb085c969f5a3b37503c0a2da0391b2171185f2a24bd9797c08db3dfcf4. 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/281da03b-be27-49b8-a194-76ef82bb3566.json and https://artists.proofprofile.net/proofs/artist/281da03b-be27-49b8-a194-76ef82bb3566.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 0x97cfda2672d63bef8583adfe6e3f1ebb7adbf4f9bf0d239349f077e8993236a0. 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/GBBPW0100058.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75d4f8b3f9633982ce276bfa27843296b0ccc0968ed9673524f1982c9dbf3e7b. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/GBMYF1600085.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x752efccc5e789d2bc1d3d9f7fb4d8090e9cdff9fb0b3ebe5b742b1094fc1f87b. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/US25X1085771.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc755d46b2089a0c5c24eafc1a1f95b3d5d68135dbfa90c52f0b5521f86e6549d. Chain 2 (Bitcoin): anchored in block 957075 (2026-07-07T18:50:38Z), 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/QZTLA2449544.
Terra - Prefuse 73 '3 Mellotrons In A Quiet Room' Version
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x768a35ca9048f58b7a662fd1c7b0de45ae0a15100fb901728c2ff6bcafed3b59. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QZH5R2000139.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x08a6552a71c560fb80633b9bd229c83e205ba1b4236cce3f81f7cecaa0c49ba0. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/GBBPW0300001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd31a9e81b9d1a33a529a4c4fca9cc1797e89271544a99238fb4a49e5ecd5dc6. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/GBBPW0300002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8987f5e987cc9fb4a0493fa95b2936f5670343ee0cae5b45dc79db39302fb772. 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/GBBPW0300003.
Uprock And Invigorate (A Prefuse/Dabrye Production)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4cae70441de82a5892e7ae1e13e02aa36ca215aa6e5785a10eca992b3988133e. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/GBBPW0300004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0173bfcc56604ae4e7396cbc5624c71e7f2c1cf6568f041e355e7620f7337a17. 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/GBBPW0300005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb80edd3301efc2a8949bdcceff0eaa4a7b7d0ef157ec0df64d5433e0a9b34f7. Chain 2 (Bitcoin): anchored in block 960220 (2026-07-30T07:28:30Z), 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/QZQAY2457610.
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 0x5130788cc91333afdfe46b91b03fb57b3b9d73cd31095d7b06cea3fcd6287266. Chain 2 (Bitcoin): anchored in block 960175 (2026-07-30T00:16:15Z), 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/QZQAY2467066.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x311e88e1efda6aeb4e60d19ae95dae2d04e3a00c46c5e081144d90027ec9439c. Chain 2 (Bitcoin): anchored in block 960099 (2026-07-29T11:30:20Z), 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/QZQAY2458565.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15a608831d44104a64bf74023bf76c116febdf7fee743a7a70006163f5865df5. Chain 2 (Bitcoin): anchored in block 960209 (2026-07-30T05:15:54Z), 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/QZQAY2499129.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84f3e487d41c6aea6afdd13358cf21004e1e2df6f437f1da997617492827062d. Chain 2 (Bitcoin): anchored in block 960218 (2026-07-30T06:57:05Z), 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/QZQAY2415483.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b82a4e3c480ab5b798a857fd83300fdbc7f28f886557456f21dba4af7690794. Chain 2 (Bitcoin): anchored in block 960309 (2026-07-30T20:35:49Z), 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/QZQAY2419867.
A Sun-Coloured Shaker - Prefuse 73 Remix
A Sun-Coloured Shaker (Prefuse 73 Remix)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6d3080cbed85faf3f85cfd4a4c98234eb2b81b22be8a62bb220d74020e387fa. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/USA2B1901270.