is a Japanese pop singer-songwriter and pianist. On May 31, 2009, her contract with Sony ended. Biography Mai Hoshimura was born on April 18, 1981, in Matsue, Shimane. Hoshimura began to learn to
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 0x220f39dcc57983dfbfae69115323258590a452ebd8a39b1ae66de70e0e17e40a. Chain 2 (Bitcoin): anchored in block 953423 (2026-06-12T21:20:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/c4206137-bb66-48fc-894d-5fa648d324c7.json and https://artists.proofprofile.net/proofs/artist/c4206137-bb66-48fc-894d-5fa648d324c7.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 0xf55e50129f6ac4f910ff9eea089fa3f7baa1d265abebc4ff4e3ea9bc05c2d917. Chain 2 (Bitcoin): anchored in block 958686 (2026-07-19T06:43:29Z), 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/JPN300300121.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3af2d15df214a952b669b4a0eac3a89867d1bee1a60ddf30a39df87100b3bc74. Chain 2 (Bitcoin): anchored in block 957863 (2026-07-13T14:41:15Z), 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/JPN300500601.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x862614f9d414125a0eb3573d2a27bad21ea0b96e883d8af19020152422f7dd5a. Chain 2 (Bitcoin): anchored in block 958544 (2026-07-18T12:14:37Z), 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/JPN300500883.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf7b987bfbe602fd76d3ba6d4b42f0096f8930a49fcb12fa0a6268b887970395. Chain 2 (Bitcoin): anchored in block 958126 (2026-07-15T11:03:42Z), 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/JPN300501801.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x466a912752fd833225b19f5723cbe1f19f76101feaa8270c9a05555b15ef11d3. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/JPU900700081.