Kwan may refer to: People Gavin Kwan, Indonesian football player Kwan (surname) (關), a Chinese surname Kwan Cheatham (born 1995), American basketball player for Ironi Nes Ziona of the Israel Baske
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 0xe96454580f462076fde481791f7f990a276157366632cb85fc229fb39b890c9c. 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/91cc956a-e227-4928-b601-759c4f83fb9a.json and https://artists.proofprofile.net/proofs/artist/91cc956a-e227-4928-b601-759c4f83fb9a.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 0x6f7e4dbd876780c6bcbb2dea2d9517d08cca673e2d1ae8668e46fecf414040a7. Chain 2 (Bitcoin): anchored in block 958607 (2026-07-18T21:01:11Z), 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/QZES62163673.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb72b703ec4f89c3c9e11a068c7db1a849d309749ac5443ef27a7df29bc3c0ba. 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/QZES62163674.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f48aec47a92836e1786c484e2daf2359ed5b4d43d439ac66f3417551cf58139. Chain 2 (Bitcoin): anchored in block 958885 (2026-07-20T13:01:04Z), 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/QZES62163675.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d430fc5d62f4e5fc1f3eb0796f6c24eb362cb73d802d6774a4248e1e4a74cf3. Chain 2 (Bitcoin): anchored in block 958695 (2026-07-19T07:37:00Z), 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/QZHN32126116.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0f7cafa44420433030468b4e4b41eb08985d567dcfe28e321fa3f35e7e6dcf0. Chain 2 (Bitcoin): anchored in block 958714 (2026-07-19T09:51:44Z), 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/QZHN32171462.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb64e050c421c751ecdec86ff4e8498006d58bd82b8580cabdeadc3a79e8dd576. Chain 2 (Bitcoin): anchored in block 957709 (2026-07-12T13:52:43Z), 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/QZMER2115416.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a0e191f49f1c7eaff378fb2e7b3e7c3edfbccd0c04371dd1f7c768e0aa0ab83. 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/QZK6L2279654.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1456b47259357210489471773c422f7e95045f1d4f262623ecd8e0d8287d813. Chain 2 (Bitcoin): anchored in block 956402 (2026-07-02T22:05:07Z), 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/QZNWV2298790.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x80eaae51be1169b08ede001a3d538c31e6fe48aa949b0f300fe3afa9765c7ed1. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/QZTB32235540.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f8bc31a4ac17d475d7830651a605797d7ab905c7bee9dc817079431803e88b2. Chain 2 (Bitcoin): anchored in block 957851 (2026-07-13T11:26:33Z), 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/QZFZ42409924.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf89149b09153f447e413c5669d7449a0bebfaac0410bd34094669c3f69fb7a93. Chain 2 (Bitcoin): anchored in block 957796 (2026-07-13T03:24:42Z), 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/QZFZ42409925.