Lưu or Luu without diacritics is a Vietnamese surname, and transliteration of the Chinese surname Liu (劉). Notable people with the surname include: thumb|Lưu (劉) family, Vietnamese Five Colours Flag
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 0xc2df74aac1d14b78f059cf5bd88fabc2bc78667d4a7c8bdbb8b5af965761d4cc. 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/4f36bc99-210b-4208-a11b-1253310863b2.json and https://artists.proofprofile.net/proofs/artist/4f36bc99-210b-4208-a11b-1253310863b2.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 0x2cf4bdc531554b0a9af0719cd83911c82a8db7769567830183c158ccb91a8769. 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/QZNWW2334152.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4601c0ebb2cbcf3a225e95a0ed3153e67d443a99bef9f3cc45f197c5eaee90a8. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/QZTB52385453.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b0818b08e44d74fbd1af5dc17e6e94784e74c6ee267b83def5f46912ef2588c. 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/QZWFL2344076.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a072cfd40dd13f9bc7711008bcadc6a5b51f1a4ef763383ca6224bb6bcd3104. Chain 2 (Bitcoin): anchored in block 956728 (2026-07-05T01:43:49Z), 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/QZES72464740.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04b2e7b62ce1cb900a7fe7c8de65e79a36d7ed61519c35aa16b43df8e3ba5647. Chain 2 (Bitcoin): anchored in block 956742 (2026-07-05T05:07:15Z), 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/QZNWS2443554.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x80a13715c699a285a5221e2847f624420db66bcd7b2b4eabac05041e9cb348ab. Chain 2 (Bitcoin): anchored in block 958765 (2026-07-19T20:29:45Z), 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/QZPLS2457685.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xffd1f44dc487593e5852c53a540880da9be5c4ff34b1210088adf5dd76013c8b. Chain 2 (Bitcoin): anchored in block 957882 (2026-07-13T16:48:10Z), 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/QZTAX2494939.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x822bfb164051e8aaf1d5400d7841d0e94adabb60216acafb92b89e8bc8250e26. 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/QZTAU2470589.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa91ddc316a91971ad7ad7914858ef43eed5f866332834305232579b009609f9b. Chain 2 (Bitcoin): anchored in block 957880 (2026-07-13T16:39:18Z), 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/QZTBB2407820.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae335c3d5261d8900d9f42d78b895bc33e8aa971c9a7cce6f427965c75f7d769. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QZZ7K2445411.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa939ff40ee41510e6bf68cb3779e9dc77b2eaa33cd87fdc68ce696546152ef51. Chain 2 (Bitcoin): anchored in block 956500 (2026-07-03T13:55:21Z), 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/QZZ7V2466587.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6df57d1563d6323684eda652b9e6b2af823c3b428cbd6945ed0a5c122a548299. 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/QZZ7V2466588.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89dfbaf507e22e9ef90908552a69d5d6ae7ff7b9df8236591b2e93d5ca054672. Chain 2 (Bitcoin): anchored in block 958903 (2026-07-20T18:03:29Z), 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/QZZ7V2466589.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xffbc990196d88c505a820ae8abff10a66d958762483202d0b063e6df4f3714d5. Chain 2 (Bitcoin): anchored in block 956576 (2026-07-04T02:06:47Z), 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/QZWFM2435280.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29b672dabfa0a0387a070d4d1c5b129b454337c2a727840abd8fd4cf3852b76f. Chain 2 (Bitcoin): anchored in block 958880 (2026-07-20T15:11:10Z), 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/QZZ7K2447464.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05447af3eb05b41de66bb737787df1f1c82ccde989f29a88efb01ff0858828fd. 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/QZZ7K2445412.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16f0642611ae6fad74fbcbecb3e6c9dc2962ac43d176999d9596d06ba841fd33. Chain 2 (Bitcoin): anchored in block 958802 (2026-07-20T01:04:02Z), 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/QZZ7V2466593.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc49087452047e4b2edb4cede8ba9819cfb1a47c704ba2d069438f64667b5442f. Chain 2 (Bitcoin): anchored in block 956728 (2026-07-05T01:43:49Z), 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/QZZ7V2466594.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdfd5694aae3e3618aa342ec15272850f9b1fe98e67a7dfda8528d3a2ec2e155c. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/QZES52548228.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe7983e9769fcb2fcd71a275d30a7f4c4c64595d0959414fe04de4228f3ccde0. 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/QZK6F2509993.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe7983e9769fcb2fcd71a275d30a7f4c4c64595d0959414fe04de4228f3ccde0. 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/QZK6F2509993.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x022f2d2cb8d760490aba25583ca40eeec5092eba659ecb2d54e1afca0cf47157. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/QZNWY2508017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a2c386444baaf4d7fc28289f77ace01e094d6bf8274ef1fe7b2eafa1551e1bd. Chain 2 (Bitcoin): anchored in block 957779 (2026-07-13T00:19:08Z), 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/QZNWY2508018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4fff456dd1f04d60b39a65a29eefc1e505c10515280c68d5c6d5345d68dbbbc4. Chain 2 (Bitcoin): anchored in block 958392 (2026-07-17T09:46:31Z), 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/QZK6F2511736.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa6e30ff5c0434a3fea983427b2e767f8d95b768cf1d05453233400191dafb10. Chain 2 (Bitcoin): anchored in block 956790 (2026-07-05T12:31:54Z), 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/QZNWY2520790.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x08c6bac50584738a07283e5ad71a5d4929b5444ff07c33bff35fbf60b380bd34. Chain 2 (Bitcoin): anchored in block 957782 (2026-07-13T00:52:48Z), 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/QZTB72504740.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa6e30ff5c0434a3fea983427b2e767f8d95b768cf1d05453233400191dafb10. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/QZNWY2520790.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4edd8fda9b9a959cf53b26697f2421c2be67f936bca968312d78fc539e3bdc4b. Chain 2 (Bitcoin): anchored in block 956484 (2026-07-03T10:47:44Z), 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/QZTB72504741.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ed200cb56c9c818a54ad19b50fdb2fb8a362682c389f8722cded0b7ffb80f13. Chain 2 (Bitcoin): anchored in block 958110 (2026-07-15T06:57:12Z), 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/QZNWY2522652.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x757bee6806134bda65080b21aa00b406217b0faed1139c9e5302282bdbb0efc4. 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/QZNWZ2542645.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7fbb42eebf4feb35b427366bd87e0fae0f1284da5dcdf1a4b3c08aa1206ac4f4. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/QZNWS2391893.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7fbb42eebf4feb35b427366bd87e0fae0f1284da5dcdf1a4b3c08aa1206ac4f4. Chain 2 (Bitcoin): anchored in block 957064 (2026-07-07T16:43:08Z), 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/QZNWS2391893.