Nok or NOK may refer to: Companies and organizations NYSE stock ticker for Nokia Corporation, based in Finland Nok Air, an airline of Thailand NOK Corporation, a Japanese manufacturer National
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 0xfdbb49cdb8d968bb837c800e3d55ca9a878a8db8ae47dbb42fef0b9842269c55. Chain 2 (Bitcoin): anchored in block 953697 (2026-06-14T21:49:28Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/681f67c7-4d2c-48f6-9f27-32e4ec203012.json and https://artists.proofprofile.net/proofs/artist/681f67c7-4d2c-48f6-9f27-32e4ec203012.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 0x289eb8682c6ef15f2532cbf3ddaa0c45cff9e36bd79d74f1ae398cda5aff50d3. Chain 2 (Bitcoin): anchored in block 959137 (2026-07-22T14:03:35Z), 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/USY242492680.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62522d33891401b6b56b32d0fe8cb0cfb7d584cee9b1ee8b2a8adbb2577c1b6d. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), 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/USY242492681.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45f71917a938b449821c9764e0a6a9d94cce2c029fae91d108dac1c2a33d49bf. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/USY242492682.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x809fca75d9cf90fb11070b937e94196b73e8fec44dd6964ecfd18794b31c0ca7. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T05:29:55Z), 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/USY242492683.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89111a404478f1cb51d4048218fd895328a11e70139b75f989afcc919781a6f5. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T05:29:55Z), 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/USY242492684.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e77d4359d4c285c656abc964bc1c97624be4cb0cffa03e2c2790bb3e0c36fcb. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/USY242492687.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6bd9ce330258987b9f73e50b2fdeba40a1f60336715c19d477db876d2727ec00. 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/USY242492688.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae446a2878417ab83dd73b0e2a50605252e5d870877326da3fb52c87a9cfea36. Chain 2 (Bitcoin): anchored in block 959094 (2026-07-22T03:33:16Z), 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/USY242492689.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x405328d96bbc00069ff34c4d2c4b795a8aa881b18aba15db3835016233dba459. 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/USY242492690.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x148446397d14294d286527e2e993eaa3740280cf3599daaed6c6bad594cb4173. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T08:41:42Z), 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/USY242492691.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25b0dee5e21dcccc22150eaf2d121ab962ad1e55807d860314d88fe129f09007. 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/USY242492692.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaef6773aa59baeb3a9a151d107ebe95c505d1e4727d8a1a2db6c49dd10d2200a. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/USY242492693.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9519c723bb90af6b6e702907135e968c75b1357787361348d2931930cabc7ffa. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/USY242492694.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf93a5dbd6f567cefd6d73544143a9243a93f83c4806f26e302cd2c61aa25c0bf. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/USY242492695.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x487a4cd571a8bfbafff18f16e13c3a14f16625669462905b36b8d240aad88872. Chain 2 (Bitcoin): anchored in block 959118 (2026-07-22T10:01:58Z), 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/USY242492696.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc0f4d3e02ef8ec8359f388afb69bdc72bd0911eef82c2b55cfe5fa47f9b3058. 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/USY242492699.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a515a0723c9090f6a635008cea42441b87453b8ba5524c5fa012f201836988a. Chain 2 (Bitcoin): anchored in block 959103 (2026-07-22T05:56:21Z), 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/USY242492700.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff1d2b1212790113e812cdb0970be8dd95d684522d87d37264535256bc13d33e. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T05:29:55Z), 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/USY242492701.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2302994f9e55e7dda6a4323a352f215ae84d808e31ea5602e3f0816935d84c9d. Chain 2 (Bitcoin): anchored in block 959137 (2026-07-22T14:03:35Z), 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/USY242492702.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68d137f1aabf910f1002c7f6d659b673e178de23ab856d09f85ab391558b205b. Chain 2 (Bitcoin): anchored in block 959105 (2026-07-22T06:33:30Z), 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/USY242492703.