Arcana Project (stylized as ARCANA PROJECT) is a Japanese vocal group. It is co-produced by Dearstage, inc. and Lantis. The group's motif is based on tarot cards, with each member assigned to a tarot
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 0xe50a19454798c2b246a9a5e7d09c511b971be810aa0dc7a2475eea27aed047bc. 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/0de2bad7-091f-4490-b4c3-8d621b29c866.json and https://artists.proofprofile.net/proofs/artist/0de2bad7-091f-4490-b4c3-8d621b29c866.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 0x445b99e6a404362a8cd0bec4a7fdad83d38d1cb4dbe3cc22e2287ccdbdac5993. Chain 2 (Bitcoin): anchored in block 958552 (2026-07-18T13:15:29Z), 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/JPI102001139.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b1b7734d2d572014ec3c17209eca8cfbe89a6c2abeea199fb4203a3c251fbd5. Chain 2 (Bitcoin): anchored in block 958063 (2026-07-14T21:07:34Z), 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/JPI102101591.
とめどない潮騒に僕たちは何を歌うだろうか
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x586eb7e389b6ea7664ca9354ac0b2a18ea81f39e00ac10afb5f81a428c6f5330. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/JPI102102770.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc1534ceaeca1d941f96066be96a9a09d8d399572258d91a7ffba78955ab44ce. Chain 2 (Bitcoin): anchored in block 958770 (2026-07-19T19:26:13Z), 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/JPI102201879.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x445b99e6a404362a8cd0bec4a7fdad83d38d1cb4dbe3cc22e2287ccdbdac5993. Chain 2 (Bitcoin): anchored in block 958943 (2026-07-21T00:27:37Z), 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/JPI102001139.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa1f32d1e0ebbedeeca3618f615efe6ccbe2b9b9bc202af5d315644e1593f5b8. Chain 2 (Bitcoin): anchored in block 958095 (2026-07-15T04:30:08Z), 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/JPI102301477.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4c832710229a2ec3db613bdb957b86eadc1c20f28002ebac42dec6b59d990dd. Chain 2 (Bitcoin): anchored in block 957766 (2026-07-12T22:25:04Z), 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/JPI102402436.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4c832710229a2ec3db613bdb957b86eadc1c20f28002ebac42dec6b59d990dd. Chain 2 (Bitcoin): anchored in block 959076 (2026-07-21T23:41:40Z), 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/JPI102402436.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc84657ad413cfc579254564d1100265fbadf634d50731abf184fe0d5530d4d7. Chain 2 (Bitcoin): anchored in block 958700 (2026-07-19T08:09:50Z), 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/JPI102403164.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ad9f9a3fbdbaa5db550a864c0c9643fd7ff32f55e8e65c4ccc2a0551d9f2f3b. Chain 2 (Bitcoin): anchored in block 958543 (2026-07-18T11:58:44Z), 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/JPI102403165.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2172dcd08e3e8404354c9fb0f2631e2bc8fc59755219ac55fdaacf670e4d98ac. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/JPI102500679.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30e1ae540b5f9a624e26fe01d2140630b135191de18f070d6b9d8892a0508f73. Chain 2 (Bitcoin): anchored in block 958335 (2026-07-16T22:37:47Z), 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/JPI102501192.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2af5e98dae6d71c0a58df88f6983534e61406e336023e3351737efb8f53e5ad. Chain 2 (Bitcoin): anchored in block 958378 (2026-07-17T06:45:39Z), 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/JPI102501193.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35d0cd3605ab76b0a213ea523f0c049cf7bf32f1f6ef277b32bd75da1e15e613. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/JPI102501945.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2887edce4b73747ecac314b4b5f07ca5fd50f8422d297ac924fae276925d9e7b. Chain 2 (Bitcoin): anchored in block 958864 (2026-07-20T10:24:04Z), 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/JPI102501946.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ba96d255b9f5070d488897674366ea69ebd7d0b716fa89a08df4f8f4fb3fc54. Chain 2 (Bitcoin): anchored in block 958846 (2026-07-20T08:14:15Z), 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/JPI102501947.