PFR may refer to: Science and technology Plug flow reactor model, a reactor simulation model Prototype Fast Reactor, a nuclear reactor at Dounreay PFR, Phosphate Flame Retardant, a type of Flame R
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 0x3c5cb40caf433a6e54ce937c52675c9d0d6b01306f4ef2860a53869fa87904b7. 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/98ce611b-5f9e-4d1b-8f83-5282a585a240.json and https://artists.proofprofile.net/proofs/artist/98ce611b-5f9e-4d1b-8f83-5282a585a240.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 0xd2bf0dee63302fc24561c2d52ed4bc98909a36b5bfdd228d75948ec74601d284. Chain 2 (Bitcoin): anchored in block 958388 (2026-07-17T09:14:21Z), 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/USSP39223891.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdcf28f68b88bb630af98d314fa4febe2b0ed1e39c47d4db3e87bff778134a25a. Chain 2 (Bitcoin): anchored in block 958867 (2026-07-20T11:08:30Z), 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/USSP39323859.
Spinnin' Round - Goldie's Last Day Album Version
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfccefdea6e069473e11a53ba8729378f31278e72749d460afd6af81a58b654ec. Chain 2 (Bitcoin): anchored in block 958943 (2026-07-21T00:27:37Z), 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/USSP39323862.
Goldie's Last Day - Goldie's Last Day Album Version
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0bb488acd875c71bd6274f4b7e69576a978a9a73dada3a41ba5e9a8e24acd45f. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/USSP39323863.
Merry Go Round - Great Lengths Album Version
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x009b3c4b6140b8c9497f06eae34a0a207c617d01199a88f221c1c0ff4d194ae8. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/USSP39423872.
The Love I Know - The Wedding Collection Album Version
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75d24367138dfde9fba7dba60edc10398be4885744dcdb2cf8fc79242d98ac03. Chain 2 (Bitcoin): anchored in block 958538 (2026-07-18T10:30:13Z), 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/USSP39411580.
Trials Turned To Gold - Great Lengths Album Version
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39cb0c8abfc1aeed23dc3663bec98a9f0f5a3fbda3b258674507b1ddf1dd8b8c. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/USSP39423874.
Blind Man Deaf Boy - Great Lengths Album Version
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19a455da1a70468d38f67b3a4bd69c27c129437e25ff0d34dd690e1295b9c2b3. Chain 2 (Bitcoin): anchored in block 958383 (2026-07-17T08:20:01Z), 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/USSP39423875.
The Grace Of God - Great Lengths Album Version
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7646ddef692ac6cf4fd6075db9e5f51bdedad36e732ff9564a3b6f8cd15d8b2c. Chain 2 (Bitcoin): anchored in block 958885 (2026-07-20T13:01:04Z), 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/USSP39423877.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc91f4af567df2e03c270c8969125175b8c67dff83c8779b93daa6c1a7603f2e. Chain 2 (Bitcoin): anchored in block 958063 (2026-07-14T21:07:34Z), 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/USSP39613198.
Great Lengths - Great Lengths Album Version
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f4e88092049f07e19debee613e3e9dec3694c52c1eaf676a518411579b9db93. Chain 2 (Bitcoin): anchored in block 958864 (2026-07-20T10:24:04Z), 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/USSP39413212.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1c4f842f9a97b8f847a82d9c77ceb6dfeef3d10ddf5616ba2151e35172f0344. Chain 2 (Bitcoin): anchored in block 958911 (2026-07-20T16:46:31Z), 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/USSP39623880.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe063389392a2d679d7ee20c6056acec0126319f9378e7457f4becd3639bf49a. Chain 2 (Bitcoin): anchored in block 959088 (2026-07-22T02:14:33Z), 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/USSP39723902.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdcf28f68b88bb630af98d314fa4febe2b0ed1e39c47d4db3e87bff778134a25a. Chain 2 (Bitcoin): anchored in block 958959 (2026-07-21T03:51:22Z), 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/USSP39323859.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc91f4af567df2e03c270c8969125175b8c67dff83c8779b93daa6c1a7603f2e. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/USSP39613198.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc6ece989cd1ded4f85ae23614dd2e1491d69686fad0427e144e7c4357ed5321e. Chain 2 (Bitcoin): anchored in block 959069 (2026-07-21T22:32:59Z), 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/USSP39223895.