is a city located in Osaka Prefecture, Japan. It has been one of the largest and most important seaports of Japan since the medieval era. Sakai is known for its kofun, keyhole-shaped burial mounds da
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 0x87027d8daccc7612c7e8c0692370d8e6ac166693155c7defd0785650262bf5b3. Chain 2 (Bitcoin): anchored in block 953762 (2026-06-15T08:21:23Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/b99df7b0-a10b-49aa-b513-67598f6143de.json and https://artists.proofprofile.net/proofs/artist/b99df7b0-a10b-49aa-b513-67598f6143de.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 0x3881ab08a7676f5f1c848fd944ef8e3a520fbdaa8547bb42c1d3322f5f77b244. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/TCJPD2542646.
KINARI (feat. youheyhey, CK the Shake, Sakai & YNZ Bounce)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc2d5859fc2157d3dfb4cbdc01534437701035a24d4cf5c909a618129969e8ea. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/TCJPD2563767.
TOPPA (feat. Yoshinuma, YNZ Bounce, KECHA & Sakai)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0dc755955220b83c854c8e843583fa3236537e726fe9874501c407d848ebd283. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/TCJPD2563771.
Wheel (feat. KECHA, Sakai & okdacomputer)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8031726e6d436e10037fbeca093588ca6040089f7df1c5fb016106212dd9dcff. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/TCJPD2563787.
Charged Up (feat. nuuuma, NF Zessho, KECHA, Sakai & tommgn)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34f1200755b73615af4cd67e69341d40c1faa8a52407da420d192a8e96217356. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/TCJPD2563809.
Clan's Rule (feat. CK the Shake, J'Da Skit, NF Zessho, JIVA Nel MONDO, Active, Mid-S, KECHA, Sakai, Yoshinuma, youheyhey, OK da Computer & DJ LICK)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d8e94b1dfe9de57e5eb5e2a02409aec0444d3b4acaef842de064d2c19d9306c. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/TCJPS2289940.
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
Desert Dust (feat. Mid-S, NF Zessho & Sakai)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4be75cfaf09165781144a3305f5e8fe701319a442c092b43bac86379b8c54ea4. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/TCJPS2289971.
Gradation (feat. NF Zessho, CK the Shake, Mid-S & Sakai)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x619c70b268d028a23b3ac10a99f01e20e6ea181e922595e4274a6423195442ab. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/TCJPS2289975.
Skinny Fat (feat. Sakai, KECHA & NF Zessho)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6783b1f5525a92a72eaec658e6da0159b5ab361967f04e7ab3fd309fb15c3a19. Chain 2 (Bitcoin): anchored in block 960268 (2026-07-30T14:53:07Z), 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/TCJPD2563754.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf44f1cf4c82065508a589b8a1a0a6e09e7a9b08e8819fb0fb9b2448758978905. Chain 2 (Bitcoin): anchored in block 960370 (2026-07-31T08:38:45Z), 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/TCJPO2164176.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f2403c0ce81312f031f1c1f5553cdc5a4b2fd76f425c3a0a6b3602ef431b9a3. Chain 2 (Bitcoin): anchored in block 960354 (2026-07-31T05:48:18Z), 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/TCJPJ1906296.