Zakai or Zakkai () is a Hebrew surname. Notable people with the surname include: David Zakai (1886 – 1978), member of the Second Aliyah, Hebrew teacher, Histadrut leader, Jewish journalist and public
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab6464f83c2ea04439c32ccdbc2fa97e9c3ee7dce07d59bb53c769842bfc5295. 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/21bff514-cb35-4bc9-ad8c-19d0556e096f.json and https://artists.proofprofile.net/proofs/artist/21bff514-cb35-4bc9-ad8c-19d0556e096f.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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7573e7fc4fbadf90a3448bb86d9ca39283fd25baeb2c1ed16e7f45cdbb3a50f. Chain 2 (Bitcoin): anchored in block 956656 (2026-07-04T14:03:39Z), 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/QZHN32183050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9b40e8c26cc6e4cc97d066dcd9f206ce114f6e9c4a5ae9f2f1c725e8d8b7c89. 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/QZK6M2132189.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32ddce0a8f1a451d15f65512d00a26b019837753e3e7a9eb98e10648beafd976. 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/QZTAU2186372.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f8ccd21261c294b7259448c24fd24e78b76db68b759ddb25714958601f8c5d3. Chain 2 (Bitcoin): anchored in block 958245 (2026-07-16T08:02:18Z), 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/QZZ792583843.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7299289a5594202ff7d2e4a02601d2ad8fc40dd9d09d597283ca50cd73516339. Chain 2 (Bitcoin): anchored in block 958166 (2026-07-15T16:39:20Z), 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/QZZ792583844.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbaa4d3507b43d667766e80c8b36258fdf9e164531ea1c2311a55a6d798a55b46. Chain 2 (Bitcoin): anchored in block 957785 (2026-07-13T01:55:31Z), 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/QZZ792583845.