KF or Kf may refer to: Businesses and brands KF Aerospace, a Canadian aerospace company KF Cargo, a Canadian cargo airline KF Defence Programs, a Canadian defense contractor Korea Foundation Air
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 0x80dd2e5d86a7f9214fcb81d687c178d4df4220d5b93feea9611f4e876bd44eee. 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/dda7ffad-18bd-48e9-a4e1-c658d0da5cef.json and https://artists.proofprofile.net/proofs/artist/dda7ffad-18bd-48e9-a4e1-c658d0da5cef.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 0xf3cd472552195ed7459dd786da9f05885bb1fe1bf28f8fcb5d0202ac4a7c401f. 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/BKEPZ2400002.
Sexta-Feira 13 (A Noite de Jason Voorhees)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2bce37f53e7ecf1b5a8ea0d34edda881b8a41a8925189b6716e322b7e83ba2f6. 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/QZNJY2381165.
Jack Mack Flack & o Velho do Inferno (Final da História o Cara de Preto)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xacf33a050eff94c60918421fdb2e2cdd978ad2e23a97af302653cf7b6b800022. 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/US7VG2349774.
Maria em ''A Chapeuzinho Vermelho'' (O Inferno Continua)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe6ee1fd77c93681a85588bfdec829cb78d1662ff47fc7b88fd0ef897820da86. 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/QZHZ42239827.
Jack Mack Flack 2 (História O Pequeno Jack)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfad5c73ee127e43284ddb127d215c9c8fe2ec98a0d4e81893ce83c3a4750bffc. 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/BCP3J2100016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65ff72a3e453f55b85e5feb361313c371b00e1c691e9cdb025c8c0d9868e1a30. Chain 2 (Bitcoin): anchored in block 960203 (2026-07-30T03:35:13Z), 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/BCP3J2100009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e6e31cff0b6525f5f3a356ce89a99efc184993076a31fbe92eb70d808bd4d50. 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/BXQDA2100003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7422dd47f41160f719e5d603641fcbe9bc741b25b563c7366f42d78f8d68a07. 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/SE6TI2011596.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5e0031c8ea7aed363e6859e046bd994ba40647126c472112bebc5f7d7a3ed3e. 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/SE6SA2065729.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb65b1c48c3a9b5ad2345f70aa97e45b3a58c16e99f8f4fc46f9d0a2cc8b8ef0c. Chain 2 (Bitcoin): anchored in block 960167 (2026-07-29T23:42:34Z), 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/SE6SA2038727.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0653b40d2889416d4dbfe0c6ffcd7eed889d34f25e38e5bc1ab73f29f58da7b3. 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/BXQDA2000002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8739287a048aa813635f4b49f6e65fb61dc79e04879368120dd4929a1c6cf7c. 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/QZHZ62058940.
Jack Mack Flack 2 (História o Pequeno Jack)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaef3498972cd3a82811edb680f8f3f09cc40efd81e4183bc83b77d28cf97dfae. Chain 2 (Bitcoin): anchored in block 957046 (2026-07-07T14:04:01Z), 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/SE6HN2145909.