thumb|330px|An oni menaces the monk Kūkai, who wards it off by chanting the Buddhist tantras. Painting by Hokusai (1760–1849). An ( ) is a kind of yōkai, demon, orc, ogre, or troll in Japanese folk
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 0x931e8347b82838f224001470b3525bd828dc3b030ea4d64f2f29685e6227daa2. Chain 2 (Bitcoin): anchored in block 953626 (2026-06-14T11:41:45Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/269a1994-da46-4938-b199-ab813baa1962.json and https://artists.proofprofile.net/proofs/artist/269a1994-da46-4938-b199-ab813baa1962.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 0x7aef0763cfe42ca70f511365b373f17db5a720bafda14ffc1b38862d96f82369. 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/QZFZ72068703.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd526aa1b09c9151cd6108555dd0cd9f0a226141eb716d6ae89317cdef77b5b8f. 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/QZFZ72068704.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f2a521a151f219100d5f2261ff16f76ab488da36ccddaeae0438d5d04fe808d. 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/QZFZ72068705.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97ad485ffd2a75e5d636aeda1b21e72092b1f54667839b29bcd2fd06ac643d98. 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/QZFZ72068706.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3f662b42ca6baa3f5d1c0481d8c3dfd3ead01a60cb42d30647919b9c8481c58. 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/QZFZ72068707.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8928755dbbb88e3629a091f300e789de1cf276ecc790b018d7339921bb3d8b04. 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/QZFZ72068709.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57267093089cb844dfe5367d97fd4731da729f4221dd16278ccb767650786b51. 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/QZFZ72068710.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74222a7ccc0262f5bff8fec0003b64e4265cba203c89751ffd1b220e14882cd9. 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/QZFZ72068711.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2d9069ffd94a42f71dadd7e5d55958cb686cd6dcd60230578d5e1ed0ab50606. 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/QZFZ72068713.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4dcbfcc93aa026613953bed8bf3dd337d498f7078128de88a30b7ddce5cae977. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/QZFZ72068716.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9179a3610e0a2547a7979ec23aab6af51b35e31c2a0c0b39b53111cc1e2ec575. Chain 2 (Bitcoin): anchored in block 957052 (2026-07-07T14:50:41Z), 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/QZFZ72068717.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3341ef91e7fdcb989ff903a28eebc7691bc3fcfd758638b4daa84c93db1995c. 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/QZFZ72068719.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a82b0ff3e68ea68c0df27bb67c02fd1b370a048aad9bf0aad3ca546b629718b. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/QZFZ72068723.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0df859f5e7bb0dbba09df855c8e94a8a0dd7ac27bcaec4cdd799ba85b219984d. Chain 2 (Bitcoin): anchored in block 956861 (2026-07-06T01:57:57Z), 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/QZFZ72068724.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f2c852368569cd1a21811097e89222efb4f095aeba55d8f2e9ef6b95848000f. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T20:12:23Z), 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/QZFZ72068721.
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 0x2e3987e68ab5bda9c02bbacb6beabc4c77508707e8448a9b318f4dfad47428b0. Chain 2 (Bitcoin): anchored in block 960389 (2026-07-31T10:20:10Z), 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/QZFZ72068708.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2a105358bf00718c0bc7023dd5378f102f2954df325770ad28d71eb1683062d. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/QZFZ72068714.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e50b352a87f97a72071eaa7b68f65c3924f67418bc8073af6c20095d004dd54. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), 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/QZFZ72068715.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3cf3b8a00f9d5fb0325f7ada925676450fbb4e60a24b57a33171fa0549b4591b. Chain 2 (Bitcoin): anchored in block 960106 (2026-07-29T12:41:21Z), 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/QZFZ72068718.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89ac947a145e2b8a719227547f1364e808ff4707dd7d666636341f665584327d. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/QZFZ72068720.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x458d83deff9265660cf9f8dbdbc97694c6a370a801e3324d6f25fb88d4fed625. Chain 2 (Bitcoin): anchored in block 960160 (2026-07-29T22:48:59Z), 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/QZFZ72068722.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7de7b2879eb40e9489f872f978f4bb446349c5f4fcf415affba2331be81df1cd. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/QZFZ72068725.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ade8678b0f2052603b9161c7c5038bda453f1824c259da73c9e80ef2f083a13. Chain 2 (Bitcoin): anchored in block 956351 (2026-07-16T14:04:05Z), 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/QZTAW2223545.