Tengu ( ; , , ) are a type of legendary creature found in Shinto belief. They are considered a type of yōkai (supernatural beings) or Shinto kami (gods or spirits). The Tengu were originally thought t
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 0xebfbe5319d4f1a3c3fc91594d90b202f898a06bbe3639fbd2dd1731731e6d8a6. 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/83abaf8a-3df9-40a8-9064-4899b63d7d96.json and https://artists.proofprofile.net/proofs/artist/83abaf8a-3df9-40a8-9064-4899b63d7d96.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 0xf097e6599ee43fbed98d2d82a6a2a5e04823f5ea211647552ac3b7b4b202d5a0. 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/QZHNA2207291.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17cb806a2918d6c2cc962b23f4a57d9947a5c7414fa47523d9cba175b6db3e31. 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/QZHNA2207294.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd402832c2b87d745d89695a1567415ef62797142bd83622cabb53d229134b479. 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/QZHNA2207297.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30da249fd55e1b47f9b6f87878364bef1bdad3d76af39e64ea29b1eb2c7a6b94. Chain 2 (Bitcoin): anchored in block 958447 (2026-07-17T19:47:19Z), 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/QZHNA2207298.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf6385028c196fe7beea59dd05828caa65d4632a283bd877135de879d6a4bd2f. Chain 2 (Bitcoin): anchored in block 958349 (2026-07-17T02:28:59Z), 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/QZHNA2207299.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34de3ad06c441e7e2420bb95abc11f90c5dccfab1727149e96fc2f38a3f4e7b5. Chain 2 (Bitcoin): anchored in block 958476 (2026-07-18T01:26:56Z), 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/QZHNA2207300.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc692ccd24acdc18e7b5bc25744f419eea4f85b4410b91f638738c8f88414619d. 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/QZHNA2207301.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab14b5714b08d0f3ff0ddfa460902e2e75d1fd96231b03f2c68715cf2756bb12. Chain 2 (Bitcoin): anchored in block 958331 (2026-07-16T21:55:37Z), 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/QZHNA2207302.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5473ef537c96fbe43173974aba3e27a278d3ea8649182f88c12c4fa9a4123652. 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/QZNWS2232789.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88ef0016741a1560cb3a0c1f7209b4130bbed0bf59b3e265a6b04a5de4a774bd. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/QZNWS2232790.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x126932c942af8ab39cd082768aa1ed8b138a1edb1e564f5dc794ee6f7c941f44. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/QZNWS2232791.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x066208609c63db4b37c9058279e35079bc0ac9e8dd4613e044a4b0cc6f7dd7a0. 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/QZNWS2232792.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b110a4862783646ee77f20bb12a849e0866239a997094c6e053d7c1a1112271. Chain 2 (Bitcoin): anchored in block 958395 (2026-07-17T10:10:33Z), 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/QZNWS2232793.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76192f2f66ed43b718e8a567d91b92da32dd6d3b5108282a0a4c98f1c1644a51. 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/QZNWS2232794.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad99efd4d4ffe024a9eb2c3b2465904af19de3787bf465c0da3164abbc4f69da. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/QZNWS2232795.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc142b67df27a6dcea223f4449ae484592e659ab053f42e876cf2fd673a09d5a6. Chain 2 (Bitcoin): anchored in block 958058 (2026-07-14T20:20:34Z), 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/QZPLS2366772.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf3fb6f1b12863cecba290197f255b82e620645847b07aad4bcc795049232abe. Chain 2 (Bitcoin): anchored in block 958388 (2026-07-17T09:14:21Z), 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/QZPLS2366773.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9a72ad6eb21fde24ceb91623768885f4153247ba8399586e21cfe9a0923f723. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/QZPLS2366774.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c923184f190908c2d0668a4ff1a421cc1a2d29ba545869cf765a7839d49572b. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T13:14:32Z), 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/QZPLS2366775.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34dce383368aec5c25dac036847ef43f490ade5cab6a05d820ea48de45ef0d32. Chain 2 (Bitcoin): anchored in block 958395 (2026-07-17T10:10:33Z), 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/QZPLS2366776.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc56b45915ef699af7b39321978fe7c3b1f8befe2917bf01c90da4902e990b706. Chain 2 (Bitcoin): anchored in block 958251 (2026-07-16T06:29:25Z), 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/QZPLS2366777.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24792a348bd391093ea784b386b2080b3fe98e45540f660e0ebbf4cc56306376. 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/QZPLS2366778.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e2e117fc6cb86732f7fd94628180313b119acfa9f6095a0cf27be58e8aff7c7. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/QZPLS2366779.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4fd2534d007d40ee56f94a0629d7e523dd145057ae95a5d9494d632f27c5b550. Chain 2 (Bitcoin): anchored in block 958401 (2026-07-17T11:10:25Z), 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/QZPLS2366780.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb461e0080b47640492ece0a01b9832907d8e29e84b31d02096e204a6100c3b2d. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/QZPLS2366781.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba5f722d9bcd34eda8409861326b87b83ed51f94643fd44fdd7742276ce05743. 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/QZPLS2366782.