Nguyễn Văn Diệp, stage name Duy Khánh (born 1 June 1936 in Triệu Phước Village, Triệu Phong District, Quang Tri Province, Việt Nam – died 12 February 2003, Fountain Valley, CA, USA) was a Vietnamese s
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 0x1671f4b94d6abfe03a65d7124d824336f67df67144c64af003c7210a2b8a6be1. 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/ad932591-d219-4524-bcfb-b2ff4679e2e2.json and https://artists.proofprofile.net/proofs/artist/ad932591-d219-4524-bcfb-b2ff4679e2e2.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Hòn Vọng Phu I,II,III (Dĩa Hát 516-2012)
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 0xa2ddc172c9d01dcdb0414cb4eb1b7cf926302b306183453bb821150f108a64c2. 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/USJ3V1106530.
Tiếng Hát Duy Khánh 2 (Hát Cho Quê Hương Việt Nam)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d5b4463490420eb47d9ea553682ec32ac747ac7f1fe7a1e97b69375cb783a3a. 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/USJ3V1107704.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1ef9453f2d61b045b5bf8f055386c49b2a82e517ad089f26deea3e7c4c80c20. 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/USJ3V1129008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x565ad9e255fec9570d8a9d66fd1760d10ee7844b0624951314bbc2b232a8fe2b. Chain 2 (Bitcoin): anchored in block 959061 (2026-07-21T21:34:21Z), 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/USJ3V1129011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87b35ffb17266883559e5fcc62420cfdffebb5cd2c83dee28dedb8ad7b0362dd. Chain 2 (Bitcoin): anchored in block 958594 (2026-07-18T18:05:01Z), 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/USJ3V1129012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb948cb82c3079634d5f4f480e6110ab0e336b67b8587a8f0d41d3af7732bd56. Chain 2 (Bitcoin): anchored in block 958202 (2026-07-15T21:23:21Z), 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/USJ3V1129014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x362b727f93ce3bf0750b950f0217b5b10179b4e63e0c0e6693ad7c7fa625d8cc. 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/USJ3V1105423.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb948cb82c3079634d5f4f480e6110ab0e336b67b8587a8f0d41d3af7732bd56. 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/USJ3V1129014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b8184e429b28db883219e96a7c2411aa1e663a49e6c07adbd152c58e1cb2ca7. 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/USJ3V1106654.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a100ac74c29ba4c48634735e184284a134c4567bb0c44adc318dcce485a3582. 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/USJ3V1106661.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb68ade52e423800bc83e8ea6ee2d4ec629a1d97c6a768287a4c01fac7e814164. Chain 2 (Bitcoin): anchored in block 958959 (2026-07-21T03:51:22Z), 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/USJ3V1106662.
Trên Bốn Vùng Chiến Thuật (1990) - Remastered
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x679e4e3fe033ac388c718f874c6a1bfc8bf6b5ed3d2e3477dbe8605c16e5cc8e. Chain 2 (Bitcoin): anchored in block 958680 (2026-07-19T06:04:14Z), 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/QM9SX2400361.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb96b59ca8130c2ad072ce68edacafcea2cd526abfcb8f66f7c6928899648edfc. Chain 2 (Bitcoin): anchored in block 958969 (2026-07-21T04:58:13Z), 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/QM9SX2400366.
Tôi Chưa Có Mùa Xuân (1992) - Remastered
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4b0227c45be74b2135916c4ddbca1645d12f6fb1bcda655666524e50cdf9fb9. 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/QM9SX2400371.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4e42a9ef5c42ae46937c38f19e9551498d9acace96d23ddfe5b8868bf9b99f4. Chain 2 (Bitcoin): anchored in block 958805 (2026-07-20T02:22:58Z), 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/USJ3V1106163.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2450e3888a6a626de0bd332acc5c209904df331690f22608fcc977ba22a28ec. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/VNA0F1780562.
Vỹ dạ đò trăng - Duy Khanh - Hương Lan - Thiên Trang
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c1f9e18670a08804dc71acce9acf83e86294ac2d76687a7f5b91c8ed56ada41. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/VNA0F1708344.
Duy Khánh Đặc Biệt (Không Biết Hôm Nay Vì Sao Tôi Buồn)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x949c409427dfbbf2ebae9b903081ddf33326336b01d28c5cd9aebfabe72d9445. 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/VNA0F2019332.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd49692fb5997157ea7487fdf800536b40e08aef44ee41e732ec7b84865677f5c. Chain 2 (Bitcoin): anchored in block 958690 (2026-07-19T07:14:39Z), 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/USJ3V1198369.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xadd1c3ce1f43c3abe5c7edbd41d7ed977ee251221fc2d81bd96fa53587efc194. 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/USJ3V1198371.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b090aa88fe688276d55dc0f83a72299a3907c4cddcf6421074147785af1621e. 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/USJ3V1198375.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33a2c591801e4a1cd5f4ee26976757e33fcdd971ef617d380e1cd2dc108ded0d. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T02:01:41Z), 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/USJ3V1198321.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x359e942f07922b675cac4a712f11a6689f36bbd632942bb12187cdefd30d46b8. 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/USJ3V1198323.
Ca Khúc Trầm Tử Thiêng (Con Quốc Việt Nam)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc65403b5c265bfcecc853e1dd194a0bbb4d546cafa97364e7e2b5817fc93d927. Chain 2 (Bitcoin): anchored in block 958955 (2026-07-21T03:03:40Z), 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/USJ3V1106170.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27c3e12aa1185e608ab32eeae2b0d5bfd31e74861c2274c0e4e89c6ea22dd4d9. Chain 2 (Bitcoin): anchored in block 958955 (2026-07-21T03:03:40Z), 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/USJ3V1105962.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77184ec653405e2847025074cebf2a66dd131228ba7282d9625c769f9536d476. Chain 2 (Bitcoin): anchored in block 959089 (2026-07-22T02:17:57Z), 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/USJ3V1142185.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f0b216599613ae2eba6b006656f2faa12870778ed3a5e811a1b3240a9549814. Chain 2 (Bitcoin): anchored in block 959011 (2026-07-21T13:26:15Z), 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/USJ3V1142187.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed92195fade16a266fe73f1631a5d7c2073a9fdd3e55084d3599ba2200873a6a. 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/USJ3V1106884.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b1270bb29e310e2ce899d08234aff04a1a58978f7f64d1e1e04cb0defbbc8d4. Chain 2 (Bitcoin): anchored in block 958383 (2026-07-17T08:20:01Z), 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/USJ3V1141995.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x703ac6594183416a4e345e72d7b1a5bc84de7a817d87416200aa9fb7924b4c61. 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/USJ3V1107699.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c7e43f75f3618443de29a6910465c7c14e8dac1b1b7b8d99226d0175c10a100. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/USJ3V1142022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68130a98967757e0e3489a3fc31de83890dfd091428beec72e8445c4a7cfa25f. 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/USJ3V1105965.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c58fcc72baa027c31aaa20b77f95673f8013671ae079f7f0625bfb73a7b47fa. Chain 2 (Bitcoin): anchored in block 957587 (2026-07-11T16:48:26Z), 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/QM9SX2400321.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x389b3775a8ea450b014e724b7d2914c062b153885afe2bc6a627c933b83a73e3. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/VNA0F2000242.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8360c480b68cec6b0acbe0088f1f877034a750e7f7701bbaee8dabf68bebefb. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/QZGCD1801902.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc150f8639569255b28a5d5da2ad7941f496a9baf352db0b9acd7041fdbc469d. 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/QZGCD1802761.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce540b5b283c5a756c91fa6158b15da52335e778f7bbc0aaba3cfa0c0e36ace0. 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/QZGCD1803763.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xabd6a816a96fd48cb769d627745a70a22a29c1c59490f9b51460a9d603864776. Chain 2 (Bitcoin): anchored in block 960296 (2026-07-30T19:11:09Z), 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/VNA0M1912059.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf51f61041e1920e878d63654ea342b8ae7858beafdf90136f451b26412578d75. 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/FR10S2267469.