, formerly and , is a Japanese company which specializes primarily in the publishing and distribution of visual novels, including both adult games under their brand Leaf and games for all ages under
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 0x91412de0fec4c2f1f874211461c8cc4f8d4b07f021b80a59caedee282429d470. 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/d0fc2ea6-6a7a-4b0d-8a12-7c745e80fdd2.json and https://artists.proofprofile.net/proofs/artist/d0fc2ea6-6a7a-4b0d-8a12-7c745e80fdd2.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
うたわれるもの 散りゆくものへの子守唄 オリジナルサウンドトラック
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 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 0x3bb7da137f1d03ec4fe29ede959afb9f875e99567ae1f5a13564c1175a9baaae. Chain 2 (Bitcoin): anchored in block 958376 (2026-07-17T06:41:00Z), 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/JPKI00608015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed0f15449bd5032798e4fcd27f53495a14a59d1391a323827cd2462692bfbca8. Chain 2 (Bitcoin): anchored in block 958455 (2026-07-17T21:28:36Z), 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/JPKI00608049.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0749a04dd3fc225bf11b17f46a93cc9bbc3aba61be4639aa17b5865228e17c0b. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/JPKI00608051.
Utawarerumono Chiriyukumonoheno Komoriuta Original Soundtrack
WHITE ALBUM2 Original Soundtrack〜introductory〜
WHITE ALBUM2 Original Soundtrack 〜closing〜
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55e514b774f40253a75232e84e29dfa5297570c8583397ea631d3da8c91b0632. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/JPZ921208623.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf5b85fd09996b402b11e39ab50e0559380499066caed329804e36890c27c265. Chain 2 (Bitcoin): anchored in block 958785 (2026-07-19T21:40:06Z), 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/JPZ921208624.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0bc45f336185be1c3c2f7c4fd1af0002924a98ca9b81f552f3acb5fc7a22f72. 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/JPZ921208633.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x908193272720d9f66238203466db2e92962d690cd75875b249499f4283c9e590. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/JPKI01012238.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb409e529d26ca4777988e491bab1bc86be27975026072b39409ddf64555f103a. Chain 2 (Bitcoin): anchored in block 958742 (2026-07-19T14:09:34Z), 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/JPZ921208596.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6918ca879f9580f27351ca0a6934f64fd0f6c72b2b226cde960d4c5c8c9bb6b1. 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/JPZ921208603.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdec98ed1c524a190275e6552394bc01945c54d46e001a6c3582b2d7ea9d697cf. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/JPZ921208604.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6c3121f1c2a0d00c1c6bc41c7b202dd2bbf3c63f74b516df8d2f3d3ea437413. Chain 2 (Bitcoin): anchored in block 958216 (2026-07-16T00:00:34Z), 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/JPZ921208605.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf44988f0ac7cc7b111e14f7f6abc3da04bae568f3cffa0affb2e41daf8bd8fea. Chain 2 (Bitcoin): anchored in block 959107 (2026-07-22T07:19:23Z), 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/JPZ921208610.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b54f5586dfb7e04e0ba08f83bb010a8a69aa6830b558d05d26891d11cdb0f62. Chain 2 (Bitcoin): anchored in block 958256 (2026-07-16T07:22:18Z), 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/JPZ921208611.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c3e19f19c9bb6e4a5bb6267c937f591cb84d93587f3abaabc7e0da144147eeb. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/JPZ921208615.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23d067de60eb22cbbb307aeebee180131b716042b702eca001726849a020cae3. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/JPZ921208618.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd00a14e2271d58205fa012b68ec60b3bb00a2af2ed63d0d0c73d16dbc7d76c18. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/JPKI01012240.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b462113e6d7cdcf17615f8b6a5a58771a57f896edc06f1b6eacd5a860d7a62b. Chain 2 (Bitcoin): anchored in block 959080 (2026-07-22T00:07:05Z), 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/JPKI01110048.
WHITE ALBUM2 Original Soundtrack introductory
WHITE ALBUM2 Original Soundtrack closing
うたわれるもの 偽りの仮面 ゲーム&アニメ オリジナルサウンドトラック 上巻
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf903bb34945d93418030d8e40bb2acf896260f75754d4ae4f1662aa7cf479bcb. Chain 2 (Bitcoin): anchored in block 959069 (2026-07-21T22:32:59Z), 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/JPKI01611386.
Utawarerumono Itsuwari No Kamen Game and Anime Original Soundtrack Vol. 1
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1834e205748224a5590e185e816f98dd576cd9cb646c789db30fb79b227ffa39. 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/JPKI01611437.
ダンジョントラベラーズ2-2 闇堕ちの乙女とはじまりの書 Original soundtrack