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 0x6fe7565ebc781a0a9df5425d448c42ae2351dc2273ad81d2af9e5e1f042ac306. 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/4292b8f5-be35-4547-9685-76da0adb310d.json and https://artists.proofprofile.net/proofs/artist/4292b8f5-be35-4547-9685-76da0adb310d.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 0xb761584b0bdaa60a82270af3845585b6d97409b2e0914b7f424b148c5bed96cf. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/JPE561112802.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c9e6da25666a44c9b0ce4b189b26b6769a690541449a0a077270a4d9db54455. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/JPQ892401002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x408ccf00501d507e8dca072c6fa0eb0afa4c139e4a70613c1513f4b7d1deb527. 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/JPE561906021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x702fceea4d8361e2df9fb59a65e84c7922d6159de4aed79414696cb1de76739c. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/JPA652105356.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9796aa69d5ed789bbdbe1b8a1e75a6ed434a12c9f95f2067d6d15bb60311e916. Chain 2 (Bitcoin): anchored in block 957754 (2026-07-12T21:26:22Z), 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/JPQ892200405.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4cf7fee942eeea78d17d8bb411744669290183edfe0462803efe70540d42f342. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/JPQ892400803.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f945cc2e1115b3611776abf847ab978171cc70c34f3930a3a618452837057b2. Chain 2 (Bitcoin): anchored in block 958980 (2026-07-21T07:04:12Z), 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/JPQ892400806.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e72ed0df4bc14029efd37901ed02aa40dc3bd7a3ec302ce036c638f436a8291. Chain 2 (Bitcoin): anchored in block 958838 (2026-07-20T07:01:21Z), 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/JPQ892400909.
VOCAMIX 39's (Mixed by shirayuki - DJ Mix)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1de02aa01d2bb5eb04de60df481d645de95b2555c071a112ba6d6f5cf0d79b49. 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/JPS532400037.
CHUNITHM ALL JUSTICE COLLECTION episode III 4
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea49d303a4f643df3e0a7f50a15b4bd5d01b14726c79b0dab8e5d259e1266bce. 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/JPX302242970.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f6444a8f63f3c85da34b9f294041e62936a492dcbe6f8621f2f99087c1420b3. Chain 2 (Bitcoin): anchored in block 960463 (2026-07-31T20:42:35Z), 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/JP92Q2200282.
Tasogare Relation CHUNITHM Original Sound Track
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe547b0b3cc1d9da77e4f58b36c3026d70a60f325eedcd3305a447cb126879394. 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/JPX301921380.
Exit Tunes Presents Entrance Dream Music2
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc966fbdc8456e237b0edc733bec805373bc46513fa92f9f75cc07ac2f9e37fd6. Chain 2 (Bitcoin): anchored in block 960095 (2026-07-29T11:07:37Z), 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/JPC231501436.
どりーみんチュチュ-初音ミク「マジカルミライ」10th Anniversary Live- (feat. 巡音ルカ)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa484e0a2598870d581e1aa2cb862fa34fa2a81f5ad91b3e2ed4aac3c73e1cb5d. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/JP92Q2400669.