Khánh Hà (born 28 March 1952 in Đà Lạt) is a Vietnamese singer. Her older brother is Tuấn Ngọc.Popular music and communication - Page 223 James Lull - 1992 "Linda Trang Dai, who along with Khanh Ha an
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 0xd9086ef7b5b337c17118a542a0d9d93d98ca9c37f06914b36a1904133961a55b. Chain 2 (Bitcoin): anchored in block 953423 (2026-06-12T21:20:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/266ce849-5e8f-446b-9890-84d30c3c915f.json and https://artists.proofprofile.net/proofs/artist/266ce849-5e8f-446b-9890-84d30c3c915f.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 0x91290a42aa68b119d3dfa277a8d9480e4e71b3c0c7e42ea2cfcaee6c88fa531b. Chain 2 (Bitcoin): anchored in block 956857 (2026-07-06T01:26:17Z), 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/QM9SX2401399.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87aeed79ca7329a5b21701ec618681e46164a955e0a946c347b2778367c552c1. Chain 2 (Bitcoin): anchored in block 957565 (2026-07-11T12:18:39Z), 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/USJ3V1086358.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62eff8af07909337976d64a10a317e29ad3af3c4a61e973653654c99f18fe721. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T15:06:03Z), 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/VNA0F1736727.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd75a8adf5362e81e8335a84082d44178feabfe92611f82337cc7491050a5d6ff. 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/USJ3V1107135.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8903df02bbb377dfdbfc03f814e8d3bc30f9f3d9c930bae7eb23926ef76cd505. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/USJ3V1086404.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37c12484e93ece63a29ff5a2b08c45d78c1a45307d14d55d00eae8e88288cafe. 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/USJ3V1086403.
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 0xc0978df59bf99d03d5d73a070cf2385d0c1cdd6f86a59f746d40df99bc978008. Chain 2 (Bitcoin): anchored in block 958060 (2026-07-14T20:39:42Z), 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/USJ3V1105568.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5be3b8d51862d824a728007fe59103880a7cb9a4fe43accafdb4a12595a263d6. 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/USJ3V1106442.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16f95a7b0465a56eee4a5f4d9fd2e0ae64f84af3f878dcd4b5e5c87598b50521. 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/USJ3V1105565.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a4a25a9b4301eeb35ce435329b31b06b5c3ca44d6e9f2fcb9ae3c3e6564b36a. Chain 2 (Bitcoin): anchored in block 958601 (2026-07-18T19:27:02Z), 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/USJ3V1086406.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbfe3b37ed45494b6c9ca6ba98f4a01fb3809738ce18844549a15017a9ae1ed9a. 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/VNA2B2501095.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x191d15c1519a0d6a3126d6094ff30ac5697e41f7703626a8f31946dbba8796b1. 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/VNA2B2501096.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37975e902df986a36c0eac7fd9a3e36f1279c7961394f14851502826a4a628fe. Chain 2 (Bitcoin): anchored in block 958544 (2026-07-18T12:14:37Z), 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/VNA2B2501097.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8102332070a7157142d62916a7133216d5e86e3dee56f45aab440c81cd8dd6b. 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/VNA2B2501098.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x82ec241058c6e2c3d48c7dce649c8451f41e825ca0d0468b73cad1d2f79c615c. Chain 2 (Bitcoin): anchored in block 958793 (2026-07-20T01:47:51Z), 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/VNA2B2501099.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4970632c582c28f011dd1935014ebd8cfb2493a7fdca9e36e575bf9528422c7. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/VNA2B2501100.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f2061ff318153e4f492bc781863e8c9cbd58caffe503029fe535cd428020e35. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/VNA2B2501102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8913ca1ca213aa950e0b14e71d468873f78c3912696e80b6f6b0004ec47a83fe. Chain 2 (Bitcoin): anchored in block 958544 (2026-07-18T12:14:37Z), 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/VNA2B2501103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5b74be2c70a48b5a35e7c97d012403244e7b79823be0dfc1a67cf65423680d2. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/QM48F1758407.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32f3fcec43c2c58533f075773068ca8399a92e21ac1122344dac43c1df338a79. Chain 2 (Bitcoin): anchored in block 957075 (2026-07-07T18:50:38Z), 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/QM48F2465201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9ddebb7fe10043cb78600d55f776a675174152c338c310f41d09996e8ee8e34. 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/QM4TW2091309.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5799c81929e159a0cc12c6e61c9a2f69ded1a59372b1014d7493b8b5577dc166. Chain 2 (Bitcoin): anchored in block 957061 (2026-07-07T16:07:00Z), 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/QM4TW2091028.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcca07ef21ab56db5233f078c5d13e4bf589c80ce7d28b20d5ed5295d00f3a705. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/QM4TW2085886.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5383e38dd0bd816d126d2c2b0934f40dd190722eb6aa69a304fa9ca9d0293816. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/QM48F1657005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x125d402f00b38ae97b6b3dd589a5f3abf924a818229e792394241728878ea280. 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/QM48F1556302.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdcb9aeb8c3636d3ac5320006c3d0a43ad042423fcda5b6e0ed1216493d042794. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/QM48F1046903.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93827e9560bc058e86352dca3f71c61bef8edfb8f243f1f35e23f30f0028e84a. 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/QM4TW2091681.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed6fd4c0f2ac1423e052f9d05fad39a6c0f290e8b38024b203d1036369e42fc0. Chain 2 (Bitcoin): anchored in block 957075 (2026-07-07T18:50:38Z), 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/QM4TW2090822.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb8330d8ff331b4bb9fe48cd820ecd11bfcab97792bd1ad7edd8167cb547bf31. Chain 2 (Bitcoin): anchored in block 960179 (2026-07-30T00:39:11Z), 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/QM48F1961910.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc902b9c3d482600708e7b910e1ac5954fc3b7967da9e64726f7c5787a798c84a. Chain 2 (Bitcoin): anchored in block 960506 (2026-08-01T03:50:58Z), 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/QM48F0534505.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb75f2c4ddd01828f1f0d061b7809b19cb0a1059fb68597ec799fa5dc3a94cd68. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/QM48F0741008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58f7a2b1554f798c74882fcccc042095b7e10de62c7f744c7532be0b8628a520. 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/QMBZ91916418.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59425e9cc0a32033962ad01f1d47b108af73517861998d5e5b85739af312ee73. Chain 2 (Bitcoin): anchored in block 960203 (2026-07-30T03:35:13Z), 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/QM48F1960908.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x766c5831e1a761c84e929473c6aa6e662cebf24da7ece06c5c8179ab1894e808. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/QM48F2264308.