Daoud may refer to: Given name David in Islam Daoud ibn al-Adid (died 1207/08), 25th Imam of Hafizi Ismailism Daoud Amoun (1867–1922), Lebanese Maronite Christian politician Daoud Ahmed Faisal
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 0x6f0d5c5b4555f152d9ed68bb254d50fa9ff5cfef4ffed0563b113fa5fbd4a0a5. 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/f2572197-188e-4dee-b5c0-3150be6f8c7d.json and https://artists.proofprofile.net/proofs/artist/f2572197-188e-4dee-b5c0-3150be6f8c7d.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 0xc798e96f5f21974bbf3d388e205c76d339c6760e823963052fffa22ad7a31057. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/QMANG2234925.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7fbcc917a4148214eef9ec5d56d2538e89c2cff7574e7702d79fa92b7c2ff1fd. Chain 2 (Bitcoin): anchored in block 958567 (2026-07-18T15:22:40Z), 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/QMANG2340814.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xabcd33416209449303e3e27f4bb57f96b11d21fb6ea48bf37fc123d2b2d71237. 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/QMANG2234760.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x756dc9c4a0c124f3a402b6acd663678fa71a579976637d60975a7fd216f382ed. 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/QMANG2234761.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x605e9d442fff26721b3ae89515330f9c7ef4d645ee0d21cbdc759cf312ca01bb. 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/QMANG2234762.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x008c97622cc084f69fb8a01473be090ef132f77537224f6bd70f378cc9cb07ca. 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/QMANG2234765.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb74c34a94b66eaf850ba5c3ffbe1ecfd2f7abe1d56139626e8d968b6ecfaaee4. Chain 2 (Bitcoin): anchored in block 958428 (2026-07-17T15:15:14Z), 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/QMANG2234766.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x569d32441cb992036c3e46aa62a90b2bb1d562955e354fa5909ee3656971aafe. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/QMANG2234769.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2724375fa72eb456488081f76ab4d1d10b185448c619576f70def926bf4dae9. Chain 2 (Bitcoin): anchored in block 958319 (2026-07-16T20:12:32Z), 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/USANG2360811.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99cd57410871a9fcd2b0f03f57d3c6f5a637376fdbdf4b4e4958820084b14cd0. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/USANG2465305.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbea27e432a0196f2f5d55b1bace0912cfd9c2689eda2eb963072259012ec903a. Chain 2 (Bitcoin): anchored in block 958935 (2026-07-20T22:08:19Z), 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/USANG2465304.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x241a45203c4631780f76606be0a67c1f8d7b07ce3f9c92a0f40d1e4d40033715. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/FR9W12517722.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x241a45203c4631780f76606be0a67c1f8d7b07ce3f9c92a0f40d1e4d40033715. Chain 2 (Bitcoin): anchored in block 957776 (2026-07-13T00:05:10Z), 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/FR9W12517722.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf93d328b9037c29c177f7349eaaddd87ab4f0ccde492668ebc747fb2e9b262bd. Chain 2 (Bitcoin): anchored in block 958432 (2026-07-17T15:43:17Z), 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/FR9W12517721.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x241a45203c4631780f76606be0a67c1f8d7b07ce3f9c92a0f40d1e4d40033715. Chain 2 (Bitcoin): anchored in block 958473 (2026-07-18T00:52:36Z), 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/FR9W12517722.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b27aa21d79ea948ab376c47357e09f8ab58d2d454f562db46e10f615f26dc90. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/FR9W12517734.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8231e6800d6122ede22c66d07ac24e575390b1265abdc5714860fa45de3181f. Chain 2 (Bitcoin): anchored in block 957782 (2026-07-13T00:52:48Z), 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/FR9W12517726.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x408d4d9ecd5f2acf3b175f95c1fae01535891681a237af2906ab8cdef3248a4e. 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/FR9W12517725.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b27aa21d79ea948ab376c47357e09f8ab58d2d454f562db46e10f615f26dc90. 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/FR9W12517734.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf93d328b9037c29c177f7349eaaddd87ab4f0ccde492668ebc747fb2e9b262bd. Chain 2 (Bitcoin): anchored in block 959134 (2026-07-22T13:34:27Z), 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/FR9W12517721.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78930abaecdc4813e8599eaa2bd1c5fe7ba70d883d7e9e51df2ea60cf7949853. 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/TCADG1774938.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8eae7d697642678be2b41b5357dcbd11daa8b8c2863b7a62b094f37fe2a679c8. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/ITDY32200030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c77d878eb4681d01189136b2ad91019642f16a7ca84088b856207f91a128c0c. 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/USANG2290311.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4d9e71a07259c23793edbc6688583b1ae13d0ae8132a3b705f32fc3d53cc5b9. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/SE5752375576.