Doan is a surname commonly found in North America, Europe, and Vietnam. Doan may refer to: People American and European surname In North America and Europe, the surname "Doan" is a variation of D
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 0xb602b353b7f4c310fcb1311b0a0a2bd1424cce43b0eb2bd9dbc2c153c5bc35b8. 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/80c12874-5c8d-4f14-b56e-88a992060cc1.json and https://artists.proofprofile.net/proofs/artist/80c12874-5c8d-4f14-b56e-88a992060cc1.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 0xdce87f5bedf9715fa4630ac67bce03d74b12bc4096698765deead3cc2a6d82fd. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/TLVEM2432822.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x371c8ee790d8f849b4544e6f7c73034b4f3611432ec9be2d5262525f4b01a06b. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QM8DG2480119.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64cabc1b37207a9b2f14e7fbfb426939432f9cacfb470caa87955f5156c0f21d. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QZS652443855.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d7db692c17b5084e48a920538321e088c0d083cac95caf377325e3f98ce3d06. 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/QZS632466470.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2dfdaad571042b4c24f069be93461fd07daeaf7f25ba595aa9fb9ea97f1d5de2. 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/QZS632461870.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17e36f473a72fe7864d185b6c8758e4c16e55e2dd1bd9e8da2ec397c955d2ebf. 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/QZMHK2490340.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31111fa6eb37fa284b9ab32ebc535311c268c8d275b3415dfff32c05b430ac95. 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/QZMHK2418688.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6bb3603078869735629440fbbfe29b7e86a7449232ef947f8b7dc8c897cc6156. 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/QZMHP2405636.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72eef5a51f8cdc34fd7bd00f06d0b8ea0b02dc90c866acb6c71a833be1df78ca. 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/QZFP52306553.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f3b24c025ec70e91c6a927a5601e8fca501b28734596caf93860ce1453ced26. 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/QZS632312008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xafe8a5e1721296d6b584572f22db4c863ec2c4b13a52790db45a73ba6adecc08. 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/QZMHN2350329.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x412ec62766e12445dea37c3fdada774c009c1a174873a7754215a35935007d05. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QZMHM2327457.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0453f3f43bdf16915aa3ba9a09b31bc866d48ec234715f1d68a463afb526a1ea. 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/QZKDK2382309.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c260a064822c477453fdcc793117e91bc10e3bfc1c74a3f5c83934239b0816a. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QZS642234287.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f8eea9037cb6c54c67d94d052d745c36459815aa3c3a167d2b7cb5dd632f636. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/QZMHN2233199.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b506256ba3a27742bedeacc53b0eea5cee97c7f72605d2ea6b01c007b714fde. 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/QZS672297445.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b3927c863cb032f1e1b38248b745b597789892d7eced256dc7168964116636f. 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/QZFP52224494.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41633811bebf6be59710d00a5cb4cac0237111f320b7fe50d6a57fb7144accd0. 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/QZMHK2263601.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x567e7b9b7f14e19a3ce8ce3a7bd6a64085d193016d085206e186c077ce8848b5. 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/QZS672285266.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfab3c41725e78f6954f1afb69db4330d7afae5a1e31cd5fd8c05d48b73029379. 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/QZMHN2263967.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7fc26945af8a9ec4069ef24cc7ac43e64cb9f4945c9912de2516e64fea6e841f. 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/QZS672160822.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02c8449726cdf9f88acc2da10beddba10ceec6ad3744126c4e88e930541f8eb3. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QZWFT2449265.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c02e8801dc17aa3b14b277b5dca60b7607bc7459dfdb1aa3cd1b2682b4c98d4. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QZTBC2492056.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xadffdc57296664769399291bad2c65c9a6b21c46ea2645200da1d977387e4c03. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QZTB62406586.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff4940a15330bd85515b4dad6c56c5570ac30712116db0567588c16089ae1fab. 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/QZTB62406587.