FB, Fb, or fb may refer to: Arts and media F♭ (musical note) FB (band), an electronic music collaboration of Benny Benassi and Ferry Corsten Facebook, a social networking website, also known as FB
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 0x5ea5578036c9108bd2415d939599e699fdcaf0576e4263e710bb202ac71ae134. 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/4d444454-baa3-459d-8d0c-38bf99e171b7.json and https://artists.proofprofile.net/proofs/artist/4d444454-baa3-459d-8d0c-38bf99e171b7.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 0xb428b65ecb1cfa568c130249af729474ef83cba1a111e70300619d9b126d0cc4. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/QZHNB2390875.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc753340b0cd9419f3318b221c19f4228a27ac2664a3147052ae6718f23bc143a. 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/QZHNB2390876.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x045223150dddfec9b6d830726ba15a5f918562481c69223d109ca3317d4624fa. 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/QZHNB2390877.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaafdacfa3e373d237cccc0ffe684d7ff86ca136d49e0ec6ccaacdbeba3af4f14. 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/QZHNB2390880.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c3af2961bb7fd0ed60bb3e1c431f68cdbf2246951c67fca17c888baaaf0df3e. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/TCAED1986972.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d4ad33596bf2291738f9b244f31a460e999818903b599e9d3fa38e28e290f20. 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/TCAED1987055.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8fe7b959419a6f48fbc5e3ceb1f890b805d9500f441f74f72c7fd300c6b53627. 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/TCAED1987148.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbfae59ca0a250cccbc560ffc8273df32ee86e52bc21057c59c9630d96008e599. 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/TCAED1987172.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31a291268e6d43cb4a2e10e2ac15f92548999ce19b2d03098f39b720ca678f49. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/TCAED1991831.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x029161153aa3ca3c51e888711775e4648f7bacec06ee1d862bbf424dd7a8107a. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/TCAEE1904418.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4739e0b320ec5e6422d3a3de26344e118b960a98e6d95e89e109f91f8e21b28f. 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/QZNWZ2294257.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5331998fa08783212cba3c35dd09a5dbf0031f6b67ea7110c464a4eeb728aeaf. 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/QZNWX2232035.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7fa194ff366b78a10c3de191979dfd7c5fa560c7e2d7f109623a806f31221a17. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/TCAEO1969863.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f0be913db49550128ad170ee84a4ec9f7bf954b638647d1bcb8a8a728b2f507. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/TCADM1877485.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2cfcbfa496d4a21aa152a5903d34aaf281a514c2768c182b2a335f607557ba9b. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/TCADN1805366.