The Focus Group is a project of experimental electronic musician and graphic designer Julian House. The Focus Group's sound is a blend of influences ranging from old library music sounds produced in t
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 0xadb834a55597a9e8692fa74caab3c8b7b6d77274ba34392338ea2fedf3b0f939. Chain 2 (Bitcoin): anchored in block 953842 (2026-06-15T22:22:30Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/edb3188c-86d0-4af3-a777-b78255260d5c.json and https://artists.proofprofile.net/proofs/artist/edb3188c-86d0-4af3-a777-b78255260d5c.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 0xc2101fb61aca9c36aadfd359fb1a08427b76a9275f6c8a112c34ce580e3e99c5. Chain 2 (Bitcoin): anchored in block 956857 (2026-07-06T01:26:17Z), 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/GBGSV0400031.
Broadcast and the Focus Group Investigate Witch Cults of the Radio Age
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8fa6a22bf687f9d8ab08558579e93e5f9545560bf000a53296ff4eee76a2e805. 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/GBGSV1300266.
Broadcast And The Focus Group Investigate Witch Cults Of The Radio Age
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9f23353fa42535d2cb7c96082754fd875de24e4b52ef586369f68680414af64. Chain 2 (Bitcoin): anchored in block 956351 (2026-07-02T11:38:34Z), 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/GBBPW0900231.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd58dc1011dd7f3da77b1ea89e9ff5973c627782da6aa07a22ca59abf5483dfba. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/GBBPW0900232.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f3a3b4ea751535e8b9045d93c641e74dc3065ff7653199c7dd0bddbaa6732e5. Chain 2 (Bitcoin): anchored in block 956351 (2026-07-02T11:38:34Z), 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/GBBPW0900233.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe13e3a8dc671e4eec9582cc2bf8248e4a1f04814f13f597f292c89ae8a12688. 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/GBBPW0900234.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0547ad4788c9bbf1c0b8e7e13a499f327ec19c035af034760261c321b74dee7e. Chain 2 (Bitcoin): anchored in block 956351 (2026-07-02T11:38:34Z), 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/GBBPW0900235.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2880c1deb56fb8b10467cae5fd60b60ae10ade9b06c1e3cd17d659e05017cfde. 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/GBBPW0900237.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46ad4f6f223d217e083abf51048ec7b3159b15ffdf2802e3d1ef6041317aa4d8. 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/GBBPW0900238.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98b19b17597db475b9616859c983098b8cd3378ec58f3e13eccf64b1e331f80f. Chain 2 (Bitcoin): anchored in block 956894 (2026-07-06T07:53:57Z), 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/GBBPW0900239.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a742dba2975318f519e2b2c2e7bf6627f8881d3e1f0bfd565191851ee85317a. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/GBBPW0900240.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49026731c0a7f8d5486893eda10cecb8b762fda2704c78467e381ed675b2a5be. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/GBBPW0900241.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83349895ccfe85d9f458157ad5df7314ff5e81a73cba25a13d4851133cb6a319. 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/GBBPW0900248.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d9e68516800204f39f6a74ecab29c157440b94690c6fac7066b91edbd54b1f6. Chain 2 (Bitcoin): anchored in block 957061 (2026-07-07T16:07:00Z), 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/GBBPW0900250.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ec52416957a58789d665049da421cfdc81c13d3b989f93f2ed60b3a049de298. Chain 2 (Bitcoin): anchored in block 959163 (2026-07-22T20:49:50Z), 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/GBBPW0900236.
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 0xb891d7d1f62429d089506bed83f11934d4b9ce0319d75ab288a41b550cf501dd. 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/GBBPW0900242.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa08444762e1f19c3e53ed324424bacfe13fc20d52d8eb3769bc7fbb13659b3b5. Chain 2 (Bitcoin): anchored in block 960121 (2026-07-29T15:22:21Z), 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/GBBPW0900243.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1b767fd1c828edd09279ff821a3dd68752b6d9648e3e78acfe8432367dddb27. 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/GBBPW0900244.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce73590a126482d404e0177a77f2a07b4a37c9adb48080bb6d92ebccafa06448. Chain 2 (Bitcoin): anchored in block 960163 (2026-07-29T23:20:38Z), 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/GBBPW0900245.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b14320efebd86a9a6b9760f1badec60db1de552ba9e43b2d529eb74aabc64fa. Chain 2 (Bitcoin): anchored in block 960150 (2026-07-29T21:51:49Z), 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/GBBPW0900246.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5039a0b15d9221c7bee3cad50a7b5825cba2eb4f66f7f59af4b2c194344f9480. 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/GBBPW0900247.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0bfed024ae4e2ae0db3983975400289bd5f046beaa906153fa3f2f70b4f8770a. 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/GBBPW0900249.