Kuan may refer to: Ethnic groups Khuen people, an aboriginal people of Laos Khün, a Tai ethnic group in southeast Asia Other uses Fan Kuan (990–1020), Chinese landscape painter of the Song dynasty L
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 0x08110216cb9a4fd40fca97acbef82b762becd18a9eefb93243d15bee49feb98a. 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/c2b0d602-07ac-4bf9-a640-a9fd814e12d3.json and https://artists.proofprofile.net/proofs/artist/c2b0d602-07ac-4bf9-a640-a9fd814e12d3.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 0xe646ed93289385bb6f705b18f7a5d57eeddba84fd5dd82d45f03049c9117a449. 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/QZFYX1902123.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb678ff2834c5d6659aa21db7feb4ff7a3c32aa4f1e5e8e9d676f8b2196d62ae6. Chain 2 (Bitcoin): anchored in block 958582 (2026-07-18T16:47:25Z), 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/QZFYX1902125.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7da046d4544ae8b764092ced36319f706905d92b51fc3867ef5290a1c0743a51. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QZFYX1902126.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05ec6f55c51290805c3cafb921e1e9b02880b97305bb103afdeb0221be0cc245. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/QZFYX1902127.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6abfd15c574add5d53bd7472cd69f869a9a541136c1e23ec2f558fa118501e3. Chain 2 (Bitcoin): anchored in block 958746 (2026-07-19T15:36:35Z), 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/QZFYX1902128.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d8cd0d3444284d7b2a7db502f6d9f0efdf812ae54621791e31bb5a1929d4d07. 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/QZFYX1902736.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9042710ff4b7dd6b15bf9c756e714b7770f8c67c6043103b8d9ae83a953422ef. Chain 2 (Bitcoin): anchored in block 958152 (2026-07-15T12:00:27Z), 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/QZFYX1902737.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60f7c156b3861f725ce623b138ef364c5c58c3a2829bcaac2fac7a6875008208. Chain 2 (Bitcoin): anchored in block 958800 (2026-07-20T00:52:19Z), 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/QZFYX1902738.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70459f4d6fbe2433365eec26579a60825e9135af1bfee234bf60018f32cc85cb. Chain 2 (Bitcoin): anchored in block 958153 (2026-07-15T12:03:04Z), 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/QZFYX1902740.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe48b13e6f5f86fcbbb55e62bd8d68dfc197f0409e58e29bfeb06e637fc723cbb. 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/QZFYX1902741.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc06a077db9f943fced2d38e6ea5b5a9f52a8eb61cc0937ba421d96d3c0e30ed8. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/QZFYX1982717.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd938d6989d6dabb9989d7e40cf37a2b38371ae1c0c8e71d64ca7a2fdb09a826d. Chain 2 (Bitcoin): anchored in block 959096 (2026-07-22T03:48:36Z), 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/QZFYX1982718.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf5b5e813ef293c0d628cd72d625b13faff03f9bbe7b28c9a41c603085d9bc23. Chain 2 (Bitcoin): anchored in block 956776 (2026-07-05T10:59:37Z), 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/QZFYX1982721.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x582375b469cd232c832483a7d676c805675a4ee668e6f7411423a0da3ac05956. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QZFYX1982724.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f9194e5fd1c45fea42d91bb1c5b6c2f6c080cfa1e1ff86b643a8fc3ca59aa61. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/QZFYX1982726.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1b71cc2982535dcda69b9d01a7e1585fb704f5cf644a324e593047e4ccd187c. Chain 2 (Bitcoin): anchored in block 958627 (2026-07-18T23:33:54Z), 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/QZFYX1908286.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60bfedae92e341738ce0dd2dbd759316655b4bd182e048233ed3bd9d2b536414. 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/QZFYX1908290.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7605d659f654155b217c6c5928563696cf2b3dbd06146cfa9acd6a20f866f97. Chain 2 (Bitcoin): anchored in block 958686 (2026-07-19T06:43:29Z), 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/QZFYX1988158.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56360e114b8cde995b9f1856856574e2d0fa579d2b815ec5b651d686a3757145. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QZFYX1988159.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6cc77c3ce71808442d5bbb7509cbb9ff10fbef3fb84cdc6ebdcbf6c290560f4b. Chain 2 (Bitcoin): anchored in block 956891 (2026-07-06T07:16:32Z), 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/QZFYX1988160.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6949573767a9113504b60b844f8b157f999aeb27952b8d375ca41a3d2217d81e. 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/QZFYX1988164.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad1a4ed7128216db3ae24295bc34987fd97d512831e706d84e1ca41301eaec11. Chain 2 (Bitcoin): anchored in block 958517 (2026-07-18T07:54:29Z), 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/QZFYX1988165.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x143f31682120e3e2df828ed7e407b689b9246a2219a51cb5ac09bbaa9ee2d766. 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/QZFYX1988166.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85c62fe330947581c8c1e6409f3aae89ee651133fd0669433d41a1a16b4bcf80. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/QZK6Q1985400.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x695c1c8cb74c9d942ec62f56ffc1c3cc6925612f2e4526dd009b6e2791b1cd5b. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QZFYY1968549.