Mari Kumamoto (熊本 マリ, born October 15, 1964) is a Japanese-born professional pianist known for her recordings of Spanish and Japanese composers. Early life Born in Tokyo, Japan, Kumamoto began pia
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 0x20b736ab1fe1bed5fd6372c93bfba918ee94071c678a72962470e9cd999efd2d. Chain 2 (Bitcoin): anchored in block 953807 (2026-06-15T16:39:18Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/e32862a6-5058-4a9f-83cc-a1bdcff7d74b.json and https://artists.proofprofile.net/proofs/artist/e32862a6-5058-4a9f-83cc-a1bdcff7d74b.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
脳の疲労をとり効率UP、お昼寝クラシック
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 0xe2d72e54684082c6cd6b4a84c4faf538dd1086e76ab8d1527b061778992729c4. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/JPKI00606888.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x637f754f9daf849eb301fda1d9158f77317a30c6a7b3c183faf4874956648acd. Chain 2 (Bitcoin): anchored in block 956776 (2026-07-05T10:59:37Z), 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/JPKI00508460.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4b4e2cfc0db9d2d262e40bc07b5512df60fa2165d090be46364ed6dbc806f96. Chain 2 (Bitcoin): anchored in block 958846 (2026-07-20T10:49:10Z), 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/JPKI00032650.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9328f841ec51bbce4c784098593e58f919a837c8605a5fbe69e3fc8192bf9d24. Chain 2 (Bitcoin): anchored in block 958860 (2026-07-20T09:58:28Z), 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/JPKI00910231.
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