thumb|Huỳnh Kim Chi Huỳnh Kim Chi, also known by the stage name Hoàng Oanh (born 6 November 1946), is a Vietnamese singer. Born in Mỹ Tho, she was popular during the 1970s before the Fall of Saigon, t
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 0x40480c53bc1afc37d50658b7db478149fd180c39f60a93d93c7c40d2187953c1. 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/f34b4f54-9596-4879-a6a0-b54d436d15c8.json and https://artists.proofprofile.net/proofs/artist/f34b4f54-9596-4879-a6a0-b54d436d15c8.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Băng Nhạc Sóng Nhạc 8 (Về Đâu Mái Tóc Người Thương)
Chuyện Tình Trương Chi Mỵ Nương (Dĩa Hát M 3427-28)
Cánh Thư Ướp Hoa Rừng (Dĩa Hát M 3447-48)
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 0xd14ec78f732e4096ea857cfe8d0e8095a521613e68a6117739aed3791f53d1cc. 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/QZGCD1800253.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0cb59125dd5c8586968969af4b7bccbde47f6e103591bb6f52cc13604a37db60. Chain 2 (Bitcoin): anchored in block 958054 (2026-07-14T19:33:24Z), 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/QZGCD1800255.
The Best Of Hoàng Oanh - Chuyến Đi Về Sáng
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf738e4c55d2fccc84a59637b42eaf397d4b8e56e74eba401a61d03736b7d26ee. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/QZGCD1800312.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d557dd47eb4bc6edee6b8bada6ef5ca35973c719b3c3cdbcb2d74e163234da0. 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/QZGCD1800314.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca05aafa8fdbee4a0410633f5533ec59840a672635efb90cde9b73d5e369b568. 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/QZGCD1800316.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x847ce264f1edc635b233520ec8900cf4f0406b6965df2d95ea32e42e5331254e. 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/QZGCD1800319.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xebb18ac470e8bf162a51a9ca12beb68fb43bbc138d8003ce0170d876577e8e2a. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/QMBZ91913881.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9545c70ee7011b165b834de541be5e8da27c4a53a643a863b4b887fe66bedf9. Chain 2 (Bitcoin): anchored in block 958765 (2026-07-19T21:00:17Z), 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/QMBZ91913884.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41315418d3cbef75ee951138544a3a8de11da5b8729ed945376ed4017be1d099. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/QMBZ91913885.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba43f3e362913a33c10a1d58dbf6133eedfe2d58104178c82865c5b58531871a. 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/QMBZ91913888.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7f8824af28758bfd78a5678a2949157f3ba254d3fad2efc7c43c19c11b23204. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/QMBZ91913893.
The Best Of Hoàng Oanh - Chuyến Đò Vĩ Tuyến 2
Chuyến Đò Vĩ Tuyến 2 (The Best Of Hoàng Oanh)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0efc40b3cb29bbe9a27640c24efce70a4226199d7f3fb61d9155442cbee977ac. 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/QZGCD1805129.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd09805d48ed12385223533c81f4a76e20d93b9a0e03407673b3e1c3cdfbc61e1. Chain 2 (Bitcoin): anchored in block 957527 (2026-07-11T06:08:55Z), 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/QZGCD1805130.
Chuyen Do Vi Tuyen - The Best Of Hoang Oanh
Chuyen Do Vi Tuyen 2 - The Best Of Hoang Oanh
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6af30fbad3d1e01d5253d94e0173fd77256bb74e5cb3ea850d7a8de849e2678f. 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/QZGCD1804373.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81858ba7b8454ea2c8cdc7cb13fb4e83f03764003c25121adfcca495d12dc74d. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T20:04:11Z), 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/QZGCD1804374.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa5e9f8d03968f836453b537eebd29476f47e4224df440c8b61403d2b2138242. 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/QZGCD1804375.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87d461b203db666e9dcbcd5a43db8763435086f62d6e1dad8e49a8c30fb08c50. 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/QZGCD1804377.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf824188a84c87c005ec0c7bda0ab493ffbe7f8ef1f98c38bf380cbd0d1d9c504. Chain 2 (Bitcoin): anchored in block 958238 (2026-07-16T06:56:57Z), 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/QZGCD1804378.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x143d71c78c61dd4752c8d232294395a171c4859c8fd318ef7df022ff120576d3. Chain 2 (Bitcoin): anchored in block 956656 (2026-07-04T14:03:39Z), 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/QZGCD1804379.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a95998007bda8691d8acec60c141ac63cdf6241e78ab4ad548f962338cabc2f. Chain 2 (Bitcoin): anchored in block 958885 (2026-07-20T15:51:29Z), 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/QZGCD1804380.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x328dc7bb048be6d9acde4035b0c17a1cd8051688fa4374480110e30a40f6c49c. 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/QZGCD1804382.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9fe7581eb663690115a8dde03bc14bf2d2974f12889482ebeef1bc61c8983f1b. 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/QZGCD1804383.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f8f27d3ebfdfbab90fb694d8a75fce25c13cb14ce36cd577d99923dd7a719d5. Chain 2 (Bitcoin): anchored in block 958673 (2026-07-19T05:38:28Z), 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/QZGCD1804386.
Trúc Phương - Ông Hoàng Của Dòng Nhạc Bolero
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbfda147de27de8533488447ec072acbcdc30ec429d72e95353c7fa8d79ee4d7b. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/QZGCD1806013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdcf7d530e2b09430d5c3b2dcb493f95d64695c3b0f97a424d64082b8e915f29a. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/QM48F1860601.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x687e2aa569811282c2fe58970df57053019d1d7e6313b866455dc3b408932b07. 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/QM48F1657408.
Liên Khúc Đêm Buồn Tỉnh Lẻ, Những Đồi Hoa Sim (Asia 283)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x241c221ee07c256fc29602a6b7d09fc795c8f39fdd652ef3cbf74ad8f95d2758. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/QZGCD1803997.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d5f1ccc6af78d83b0271293801ce7b1218a9d39f8b807fcbb402a96eef836cb. 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/QM4TW2090826.
Nhật Trường - Trần Thiện Thanh: Anh không chết đâu anh (ASIA 50)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ea279aab185f3aaebad471f66fd81006c8239611d46d003870ea10ecb127ed2. Chain 2 (Bitcoin): anchored in block 960288 (2026-07-30T17:41:38Z), 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/QZGCD1806596.
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 0x04aca1c7b109b9900a4d419e0994afe0ac5f9ae9e9a429450c7145da047ec9e4. Chain 2 (Bitcoin): anchored in block 960125 (2026-07-29T15:38:18Z), 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/QZGCD1806047.
Saigon Nostalgia - Sài Gòn kỷ niệm (ASIA 68)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a26dd9bfff6ac585335b3a9da46e89ff0eec03d526f53e87b5bcdec88ada307. Chain 2 (Bitcoin): anchored in block 960503 (2026-08-01T03:41:24Z), 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/QZGCD1806160.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc26fd23f75cf818415f7128bcda83d98450ed595e3a6ea385ee8a95662abb8a5. 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/QM48F2465109.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3236b16af9ee65f911f46f850b0b3cbd631411a2c55a5695e62cfa71eb52763. Chain 2 (Bitcoin): anchored in block 960210 (2026-07-30T05:21:45Z), 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/QM4TW2091475.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x351bed114653dca0e06e717a18a524eb93aef2befc7ec22d1f86dcaa7143d81d. 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/QM4TW2090823.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb80e3a3e68458b0381deaf4b9536ec4dd247f3580b021d9aa254e3265f2deae3. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/QZGCD1805949.