KD and variants may refer to: Businesses and organizations Transportation KD Avia, a former Russian airline (IATA code KD) KD Transportation Group, a South Korean bus company Kalstar Aviation (IAT
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 0xafd08ebe9fcf284e83ac60947fbcdfeac1b837fcdfab21d35659ae07261ce0d8. 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/1b56f5d4-bd0d-4651-9e0e-e9d59c2c8b66.json and https://artists.proofprofile.net/proofs/artist/1b56f5d4-bd0d-4651-9e0e-e9d59c2c8b66.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 0x7c3f2f32aea009376a54b5c039a20670c810c1f45be28f97c5a96ce027d2955e. Chain 2 (Bitcoin): anchored in block 957741 (2026-07-12T18:30:59Z), 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/QZNWZ2284347.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5fee9c11bc355e06797abaa88e8647dac5e34d037baa3222a03e677ccfe79a37. Chain 2 (Bitcoin): anchored in block 957741 (2026-07-12T18:30:59Z), 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/QZNWZ2284349.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdfcc02bba2c70405fa81c1b13f1cdb9ffb35a61818f2c6c171109a79f0104e44. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/QZNWZ2284350.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x018fb75cb180ce9edbc057d91f463bee3e95a8d6f55803c34a814a3135a5a977. Chain 2 (Bitcoin): anchored in block 958067 (2026-07-14T21:26:15Z), 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/QZNWZ2284351.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1516cbb9f2f3aed195c18bd99346e4afc5f9e41c8b49f4d4ff84b814612b508. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T23:10:18Z), 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/QZNWZ2284352.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x51155084f412c3fab36294e8c591b89c53cda1441c76573f36c607e7ea993f1f. Chain 2 (Bitcoin): anchored in block 958350 (2026-07-17T02:31:22Z), 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/QZNWZ2284353.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ff9fa64179692e894628bd551239694479575c1ac288fcaf75877e60b78919d. Chain 2 (Bitcoin): anchored in block 958401 (2026-07-17T11:10:25Z), 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/QZNWZ2284354.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6445215f7dee90f67dee26142aefb2fe2d073390fc9483b0f7ba33060d74fa28. Chain 2 (Bitcoin): anchored in block 957741 (2026-07-12T18:30:59Z), 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/QZNWZ2284355.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26bfd3dc143d8631cd2cdd751fb42587b3f0df41ad63d92534f1db8ef63ef647. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/QZNWZ2284356.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24feaa862530530c146a4002333c8076645ab4d698ad342b414958a2e8aaf9eb. Chain 2 (Bitcoin): anchored in block 958067 (2026-07-14T21:26:15Z), 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/QZNWZ2284357.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46de16d126ba5254cc26de29e39d68b7701724dbcdfd360b0f7d72d5e58a37ab. Chain 2 (Bitcoin): anchored in block 958163 (2026-07-15T14:38:07Z), 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/QZNWZ2284358.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25f62e146539ae94045f364155a611c9abfb410bc8ea55b261e4d0de74464005. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QZNWZ2284359.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6544cc369e033b276dd871eece3b7aa440f47b1f7cd5663532be36c880b930f1. 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/QZNWZ2284360.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90da810bee267624b96af1edc541cde9cfa46fada37b0b111f99d7d064537a2f. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/QZNWZ2284361.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31ad2830fa78fd46322dbe7659c8f7cf1d2ce05b00d953c96df85e1b1f9bfc30. Chain 2 (Bitcoin): anchored in block 957728 (2026-07-12T16:20:40Z), 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/QZTAY2365099.