right|thumb|200px|Kisen Hōshi, from the Hyakunin Isshu. (fl. 810-824 CE) was an early Heian period Buddhist monk and waka poet. Little is known about his life other than that he lived in . When Ki
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 0xa0395b9ed484842bf1595c470cabe590d9b3a90d2be101013f1340f16b76fb52. 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/ddd30d0a-e944-4132-aa20-3571782cccda.json and https://artists.proofprofile.net/proofs/artist/ddd30d0a-e944-4132-aa20-3571782cccda.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 0x5527435d68e4f98970c5fac35aae7e1b07597ec9d762bda741d6d4fb09683b9c. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/TCAGN2293831.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36800e0abff468983c8f9f7064257a52c9c21a7c476318faf8ff6dbeadccb391. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/QZNWW2475233.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1cb15a0d85d07daaea5e4b76fc64ca09ce42e3d2e120b814bcf83ceb0754657d. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/QZK6N2496981.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8cd70d0a08b0ba99986af39d697aef559957dbdbf8a859baec3734634a5e48f5. Chain 2 (Bitcoin): anchored in block 956349 (2026-07-02T11:34:59Z), 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/NO2DY2400192.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19aa862336d6805435fe8c8fbf9fbcd163716d97a77c51ba28bd665b6f299fb3. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/QZHN92450597.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad2ca06d897f495bace3b1a7a216bab872b31474f91bbc11da88879c34ee9e8d. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/USA2P2417084.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb21f0154cef022d6067c390dc0672b96aa7c7dd4ed5993b57b828ada3392c714. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QZFYZ2464204.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05215287d23c31f7cca26cf3a5b43b4ed4ed364c37283cbe3a9a173a5ce89ff7. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/SEYOK2400175.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ffa55ce9ee2792a39cf5f5cf234807b1231736d78aedd3c52d517c3cbe2e5c5. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/QZWFK2303784.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x382e124bcb56db5411ec59f9d31c7b64533ed02d1cdb05776e210605dd665262. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/USA2P2350816.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc47c5cfac2e5c8b65cb176b4c72cfe0c7d9a7fe6ae4e381e06c7ec7a201a66c9. Chain 2 (Bitcoin): anchored in block 956349 (2026-07-02T11:34:59Z), 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/QZTB22304489.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37351f2157447f2eb791a7c4a47acfbdb5eb9dc24e9cb19f3936228d75141775. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/QZTAS2343568.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x320af575f94a6d712aab50eba8d9950cde38df784ae6fd4cb34ba1895605116a. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/TCAGG2264217.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x175b4f678f8b2e41240fbed76ff1f251f61edb7769b76e0d1c3152adb366ab54. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/TCAGG2212223.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa88361440db8cb375f9a0d13d5a0fda344a48a65cb349a72658cd0a085ffcc8. Chain 2 (Bitcoin): anchored in block 956351 (2026-07-02T11:38:34Z), 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/TCAFX2127093.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c94f7e80636115b2ddf55962cd3a329a3721a3b3edf6c3789b05dcc77ceeb83. Chain 2 (Bitcoin): anchored in block 956894 (2026-07-06T07:53:57Z), 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/UKXN21947575.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x832d8de77ad8f479b61da17158da861253340e12383d2a7cb31690d78df79bc7. 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/TCAEH1928681.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf347ab721464ab257688a2221f71403cbe380ade21ceab5ba79e596bd59479bb. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/TCAEK1983506.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1ce7ce35fc096b3b09e922c12490d05cea6abd1b80059b50774ebfb014b7b77. Chain 2 (Bitcoin): anchored in block 959163 (2026-07-22T20:52:35Z), 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/TCAFC2040667.
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