F3 or F03 may refer to: Computing F3, a function key on a computer keyboard F3 (language), the working name for JavaFX Script, a scripting language Fat-Free Framework, a PHP web application fram
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 0xbaa6156f2b7e12abd053a8121e70b366091f537c5f855b7911488f773c26a085. Chain 2 (Bitcoin): anchored in block 953803 (2026-06-15T15:41:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/e653a870-47f6-4790-9352-61feaf5f6fd3.json and https://artists.proofprofile.net/proofs/artist/e653a870-47f6-4790-9352-61feaf5f6fd3.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 0xa93e08055972be15c18973d7e39bab72f35a850c31b9a10fac638b07a4deb537. 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/QT3F82521420.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66f6364163d9e37825643111342b353e72e53bde0ee2159d23278d859f9db995. Chain 2 (Bitcoin): anchored in block 958846 (2026-07-20T08:14:15Z), 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/QT3F82521421.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x561e3d1bfa51c3e626f76bcd18a76129f9cfd2f5ba4c10cad4edfba049f5a0e9. Chain 2 (Bitcoin): anchored in block 958805 (2026-07-20T02:22:58Z), 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/QT3F82521422.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x285c2b3ef36a1a7a0d05fd5bfbc4772f97c6def4088807e7ca4908a141ea7b25. Chain 2 (Bitcoin): anchored in block 958830 (2026-07-20T05:30:12Z), 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/QT3F82521423.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb96bf39cfcc23facb6073bfe68cdaa5850a9b9b5818831bb4795c32b0eab3b3. Chain 2 (Bitcoin): anchored in block 958808 (2026-07-20T02:49:15Z), 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/QT3F82521424.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3bbed759b304ae0937e7844ad1646d9b59d5cad667f732361360fd14a8610dba. Chain 2 (Bitcoin): anchored in block 958779 (2026-07-19T21:08:39Z), 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/QT3F82521425.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec9a095a32682cb2c622a28a2f2aa9e1693227554537ffd59611ee9c49cc9500. Chain 2 (Bitcoin): anchored in block 958779 (2026-07-19T21:08:39Z), 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/QT3F82521426.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21860a6f517d3346a76b9c9c5bdc66b2bb58b5b0798bccc11716cf8d90597f71. Chain 2 (Bitcoin): anchored in block 958779 (2026-07-19T21:08:39Z), 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/QT3F82521427.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc64c6094f4324c1674f7c250879f6c36a1620086fe03bc5182dd9f5c8f72249. Chain 2 (Bitcoin): anchored in block 958825 (2026-07-20T04:55:29Z), 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/QT3F82521428.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x662019ff5b3321b1691c2b9c6f924e3230b02a58ec0dffe436c161b758753f87. Chain 2 (Bitcoin): anchored in block 958798 (2026-07-20T00:05:41Z), 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/QT3F82575105.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d72471422a59e02cf576c6af8d7315d77df31bd3b8f11b25de73ba69fdc4595. Chain 2 (Bitcoin): anchored in block 958796 (2026-07-20T00:01:46Z), 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/QT3F82575106.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f81164129c2074a6a51c1e77bb0511602242e954e2395a7bf1aa8939ba4f43d. Chain 2 (Bitcoin): anchored in block 958805 (2026-07-20T02:22:58Z), 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/QT3F82575107.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfff03d9d9ae70b83bfc256e8808233f85b5c8b7db450a8d778f2a518c5b66908. Chain 2 (Bitcoin): anchored in block 958828 (2026-07-20T05:21:06Z), 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/QT3F82575108.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a5975746246bb0b0e38eb3d99bffd56af22f1a64ef9d796a116ad4c5cbf799e. Chain 2 (Bitcoin): anchored in block 958832 (2026-07-20T05:43:55Z), 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/QT3F82575109.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04ff55472a3d0d7f049556dbd73806a5d41edbba27c957893d562bef35bb3b9b. Chain 2 (Bitcoin): anchored in block 958770 (2026-07-19T19:26:13Z), 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/QT3F82575110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc547e3c8b54c77886cfe3733a9c474ea43ed10afcfe15cbfa72f668e34b0b2cf. 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/QT3F82575111.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x262e66ec77a20cb8a04b674574f44fdab80198c40348a1f9d7190d55661f73c9. Chain 2 (Bitcoin): anchored in block 958834 (2026-07-20T05:55:47Z), 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/QT3F82575112.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x888578d842d144b8dc34259041959d886832421c43107aa034286e748f78f4f1. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/QT3F82575113.