Oanh Thi "Cecilia" Bui, written in Vietnamese as "Bùi Thị Oanh" and known by the stage name Lệ Thu (July 16, 1943 – January 15, 2021), was a Vietnamese-American singer. Born in Hải Phòng, she was well
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 0x45f74276ac41d5cf97293890ef658061002cd8a4a2574e3226db5321fe1a7144. Chain 2 (Bitcoin): anchored in block 953408 (2026-06-12T19:28:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/595c7964-10bc-4759-8e52-3cfadcbfe752.json and https://artists.proofprofile.net/proofs/artist/595c7964-10bc-4759-8e52-3cfadcbfe752.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Những Nụ Mầm Mới (10 Tình Khúc Bất Hủ của Trịnh Công Sơn)
Băng Nhạc Sơn Ca 9 (Lệ Thu và Những Ca Khúc Tiền Chiến)
Tiếng Hát Lệ Thu 1 (Như Một Tác Phẩm Để Đời)
Lệ Thu & Những Giòng Nhạc Bất Tử (Một Tác Phẩm Để Đời 4)
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 0x73018f8dfaf46b7035cbbb09aea9765d8e5b8d1c845616fbd57ae6166042ef7d. Chain 2 (Bitcoin): anchored in block 958238 (2026-07-16T06:58:55Z), 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/VNA0F2010511.
Vọng Ngày Xanh Lệ Thu (Như Một Tác Phẩm Để Đời 5)
Lệ Thu & Những Giòng Nhạc Tình (Một Tác Phẩm Để Đời 3)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x961513859786c50b5102ef3ab041257469f4783ea1f037b995f0862d53e68259. Chain 2 (Bitcoin): anchored in block 958319 (2026-07-16T22:06:17Z), 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/USJ3V1105937.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59ae304860abd1a76bf66614a957d77a2206ff031c450cf3507669de4e38508a. 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/USJ3V1087065.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbacb9efdd2f0035192548e1dc23a4fe198a9cae4d4ae47f09f00264e2a82ce65. Chain 2 (Bitcoin): anchored in block 958152 (2026-07-15T13:56:44Z), 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/USJ3V1087075.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5d494205856e3a6aafc5abef444426cc340107d28471b4ec7e6d5532ed87d7c. 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/USJ3V1086317.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4d8e8dfcd074e369131d9d38353fe2f4bee86513b23f57a0deda1d9a09c52fa. Chain 2 (Bitcoin): anchored in block 958468 (2026-07-18T00:27:51Z), 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/USJ3V1087074.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x126a63d9b9132e886e1b848b3e548e48ad4339870dacbea4a8c258346ba93590. Chain 2 (Bitcoin): anchored in block 958448 (2026-07-17T19:49:21Z), 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/USJ3V1086322.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea8bbfc5b86d28a8441ab919aad6a307d788732ac5b24e4f81953c89ca44c3b7. 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/USJ3V1087070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x538f7b54f327ffc925a10eba3ece2fc825b5a12232b0dac75f6b3b8879eb21df. 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/USJ3V1087062.
Planète verte: chimbay, l'oiseau s'envole (viêt nam)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7386ca2d303f92337a71ceb1c48179f46fecf40856ec5f3121a3d39df35b5dbd. 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/USCGJ1929943.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0cfae651945769f2a3c5ce1195ced942edc71fd2181f10942ffd5cdd9ae24e2d. Chain 2 (Bitcoin): anchored in block 958303 (2026-07-16T16:39:24Z), 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/VNA0F1720089.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2dfa34b4e95174571d9a8f24fbb9cd69667a4342094a9810e27c6ae1a9d0c16a. 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/QM48F2163105.
Tình Đầu Là Kỷ Niệm Sầu (1989) [Remastered]
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6243ccc50179af810664f783c1768b15e5da14018a531327cb2d3810e1ca911f. 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/QZGCD1807630.
Mùa Xuân Đầu Tiên - Tình Khúc Tuấn Khanh
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x968f97b262e4b9e98ef4ffc16790c362929381cc8f0e21ebeaba3a8267c4927b. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QM4TW2085784.
Liên Khúc Trịnh Công Sơn: Diễm Xưa, Hạ Trắng
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7ea5c3f883d512c4bbac7dcfb03e9c74863ab35c62f71e8c8cdb2064b9a1f90. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/QZGCD1803988.
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 0xb60b9084e3790b3999030d5cb1e05ee871ee11ab5de8a9397f2f682bfee047fd. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/QZGCD1803527.
Liên Khúc: Nước Mắt Mùa Thu, Mùa Thu Đã Chết
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5070fd61bab2b2438f57249b84095fe7073a8e370db457671c3f6168ff3ab573. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/QZGCD1804339.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x980827ed751d66e04de2fac6355b44598d96d574038fc05914e2cbd6ecb14830. Chain 2 (Bitcoin): anchored in block 960157 (2026-07-29T22:12:10Z), 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/QZGCD1805937.
Tác giả - Tác phẩm 4: Liên khúc tuyệt vời - Tình ca muôn thuở (ASIA 69)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8033fe90979a3227174c9048fc6e9714317539f9388f9c7f6d5b58d41bcbe5e. Chain 2 (Bitcoin): anchored in block 960459 (2026-07-31T20:22:46Z), 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/QZGCD1806130.