Trịnh Công Sơn (February 28, 1939 – April 1, 2001) was a Vietnamese musician, songwriter, painter and poet.Dale Alan Olsen Popular Music of Vietnam: The Politics of Remembering 2008 "Trịnh Công Sơn"
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 0x45211ee9cda189bb06b64f6bc94feb39ce5c85499e335db2745703652a2356f9. 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/9096de28-8512-4b74-9409-649fecd32423.json and https://artists.proofprofile.net/proofs/artist/9096de28-8512-4b74-9409-649fecd32423.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 0xb5bbf8764f1c0226449e855313d1cfe4a5ce1399fd2483378d5b078ee73075e9. 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/VNA0F1735815.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a24af9a31545218a516c673cf974409e61d649694939c98f2d6d44336c3bf01. 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/VNA0F1735817.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0af42e7eb96998744477b0867b4237c93c119a1c4c87a5523dc1a3d4832ebbdc. Chain 2 (Bitcoin): anchored in block 958238 (2026-07-16T04:30:31Z), 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/VNA0F1735819.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc27a304d40fefc0996ebbf1aff5eb82ade4c6122c03178003258a3b53e6bee1c. Chain 2 (Bitcoin): anchored in block 958774 (2026-07-19T20:03:27Z), 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/VNA0F1735821.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf382fc5ee60178ea606f1dbd0c540e5ef9acdd79ccc365e1537cf5eb7658a7b4. 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/VNA0F1735822.
Dấu chân địa đàng - Live Latin Jazz Trio - Quartet
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f18079bfdb5b33d7387dd3d9b7bdd43dfa921f279ac1a08b84ded1210967179. 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/VNA0F1736114.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7b31fe04fe85a8bc18460df4efcd3499f40a1590ffb06e67eb657e6e69f77d4. Chain 2 (Bitcoin): anchored in block 958538 (2026-07-18T10:30:13Z), 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/VNA0F1736115.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73ede3360ae360059fe8ef87f9a92344398ca7ed70e92085a8aadb75122ae758. Chain 2 (Bitcoin): anchored in block 959001 (2026-07-21T11:41:42Z), 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/FRX872264171.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ce628eade117ad9e003b2c2cfc87cd7505aa084122e7dacef5937563105f464. Chain 2 (Bitcoin): anchored in block 960485 (2026-08-01T00:10:46Z), 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/FRX282476982.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0643859b29f38e08368b000ed7c6170be892748b37e0382f9518d1feec16792b. Chain 2 (Bitcoin): anchored in block 960354 (2026-07-31T05:48:18Z), 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/FRX282476983.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b5615ad90b015fb1bc0e1e3d41885b235cea2987eea3de79ac38b4c437d031b. 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/FRX282476984.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x236f0574fbea0ae60228c7259fd77e64a489b181854ce0067d57ac4e447e1ae3. 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/FRX282476985.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d1ddc929fa27421662826f21b47820a72a9fe21e70123046820d1e3269f1e3f. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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/FRX282476986.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a66b3990b8c92cce19cb3b0b8f637c6e2a20e9ea7384624081835f25e4f26a8. 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/FRX282476988.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcefd5c37bff6d89e92782fd9031a7c5b900771409632bdd565a2112558525988. Chain 2 (Bitcoin): anchored in block 960360 (2026-07-31T06:42:11Z), 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/FRX282476989.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c0311553e1128cb6afc61efb9f23a805194345b5dceab498bd1df449a6b67c9. 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/FRX282476990.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe00e71e60901be1656373383dce63e532e2dcb4e79f21db59e22bda3292a3978. Chain 2 (Bitcoin): anchored in block 960497 (2026-08-01T02:22:04Z), 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/FRX282476991.