thumb NSND Nguyễn Thị Thanh Hiền, also known by the stage name Thu Hiền (Đông Hưng, Thái Bình, 3 May 1952) is a Vietnamese traditional singer. She began by singing revolutionary songs,Vietnamese studi
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 0x48d661b9b61228a5110f5d487004a2f9fe553460d4483cef641c450af0ea0c50. 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/d23e30b6-1ad1-4ce9-a94a-a78b57234728.json and https://artists.proofprofile.net/proofs/artist/d23e30b6-1ad1-4ce9-a94a-a78b57234728.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 0xa06bb53a742b29d0af342748c062f0cd4bc52ef453030865ddb6c5d00a941994. 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/VNA0F1798835.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd16960a187b09def90501e4c8f874f41d15ab778f5279f93927f5591a3d6c5bc. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T15:22:58Z), 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/VNA0F1798841.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98f3f7584cc477677e8a1eef918fdc504579135b59773772f08ada33668760ea. 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/VNA0F1798878.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xebf686fdbf887e718eeaac931e8cd54605f1d5ecbd8893f8ff6c9670aa707821. 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/VNA0F1798882.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8268aaaa9897f37cd012a4bdd1a680d97750bd77d8e3f760472e7effb4ce3db. Chain 2 (Bitcoin): anchored in block 957895 (2026-07-13T18:41:29Z), 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/VNA0F1798479.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1c5cdb1818e459b4a58964e6e19f408c1bcd810f4756d592fd87d3a398e0df5. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T15:22:58Z), 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/VNA0F1798951.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7049821ccbecb0ad8b419c6c17f2708fcd83618649a65c9509c182b27d69f2ca. 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/VNA0F1798819.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4da88b19daf0393d89d1992b4a90ece61a144ecc1deee3a134fb0ed0306ab01. Chain 2 (Bitcoin): anchored in block 958561 (2026-07-18T14:22:01Z), 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/VNA0F1798895.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3fe3c8e6ea0f87392272f4bea141829a8d623af655f2ee35ccfc3c69524207e. Chain 2 (Bitcoin): anchored in block 957531 (2026-07-11T06:55:18Z), 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/VNA0F1798658.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d225b0a190575761229fad93753f48acb5281a5330db940af2a31d6d9bcb92e. Chain 2 (Bitcoin): anchored in block 958656 (2026-07-19T04:04:08Z), 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/VNA0F1798665.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb47ff63f18e428d54566e029803ea79e57f36232275e0e9e1dd2b5d3293d5eaf. Chain 2 (Bitcoin): anchored in block 958335 (2026-07-16T22:37:47Z), 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/VNA0F1798667.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x09833c7b11269853bd0040468928db83066b491e001eeaf7cdc573779b38231f. 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/VNA0F1798668.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9dc1be6727817bd4bbe23ace63d51a93e0c364ba0df6526a1de30a35b7867cf. 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/VNA0F1728489.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62dd8fa180654f84a12c2df4d14edd2d16d045a726528c1ade441776b5a9b8e6. 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/VNA0F1728497.