Deka, or DEKA may refer to: deka-, a variant spelling of deca-, a metric prefix Deka, Pomeranian Voivodeship, village in northern Poland DEKA (New Zealand), a defunct discount store chain, formerl
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 0x1e7cc26e3810748a759301b925f35a2441a3d052d6fe7ee1e61fa0f103a2b92b. Chain 2 (Bitcoin): anchored in block 954066 (2026-06-17T08:11:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/623d899a-d682-4416-91f8-d25b35f0362a.json and https://artists.proofprofile.net/proofs/artist/623d899a-d682-4416-91f8-d25b35f0362a.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
sawayakakyabade (feat. NOLIEL.nonono & tadasi)
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 0x60e280a42c2639b5a2d9e977e5036a02d3067c6e332cfdeb27f57a719d75996a. Chain 2 (Bitcoin): anchored in block 958897 (2026-07-20T14:57:46Z), 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/TCJPR2279059.
umarizima (feat. matubaratadatuki, yiozakoukenn & toubaruramu)
生まり島 (feat. 松原忠之, 与座幸賢 & 桃原来夢)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2619050ac73ae049aab02fffa883fe3e51edb2e78db326a570eadacbca63a9ea. Chain 2 (Bitcoin): anchored in block 958771 (2026-07-19T19:27:18Z), 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/TCJPU2337520.
konosimanosorani (feat. matsubaratadayuki & yozakouken)
GOING HOME (feat. isigakiyosimichi) [GOING HOME REMIX]
GOING HOME (feat. 石垣吉道) [GOING HOME REMIX]
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3ae97d1d1d378dbd2b5bc7aadeb542dd55fd525a5955499cfb151bb7f11053b. Chain 2 (Bitcoin): anchored in block 958788 (2026-07-19T22:07:06Z), 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/TCJPX2322624.
kanpai (feat. tadayuki matubara, kouken yoza & kakeru kanekodan)
kikutotuyu (feat. ta-da & kakeru kanekodan)