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 0x69820027d3e9a3f25e2fdadffb781d45e0bcbfa4d6ce2eed399cc5fb43a71371. 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/db1c76c4-5746-481a-9ec1-e792cfa185df.json and https://artists.proofprofile.net/proofs/artist/db1c76c4-5746-481a-9ec1-e792cfa185df.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 0xdfce73ae57b587ec5908a8da92721dbc1310c728e4988eb7ca05315a579856d1. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/US7VG1600470.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9f8e86ff4d38c4d7a167d1afbabc50fb25e6b3b8e63b7fc415d7fb2b7d12029. Chain 2 (Bitcoin): anchored in block 958808 (2026-07-20T02:49:15Z), 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/US7VG1600473.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff7553c00c2544d8dff00fe4f07ae8a5ea6af66e3ced8d609ba11a6ef73717ba. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/US7VG1600481.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ddd954ce9450033962849b1dea4e44e8694216eac340220136869a657f8dfd7. Chain 2 (Bitcoin): anchored in block 958711 (2026-07-19T09:26:32Z), 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/QZ5AB1634974.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa26216d40d9251c713d046fc8962a79da2e2152bb90586043dc77d332a42f64e. 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/BK4DA2210544.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c7c57008f9629e196a39791bb8bb14f82f337cd3aab432c56cba48f341b2d0e. Chain 2 (Bitcoin): anchored in block 958975 (2026-07-21T06:12:52Z), 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/MXUM72300746.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeba648e1f778f363a90f09324e236fc0073e49716271de9cc4592090979a4b0e. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T21:04:17Z), 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/MXUM72300922.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7049f6cc5f12f0a1f0579c44d84563785c2e0e0e8f2b0073c25cb95a028d38ab. 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/MXUM72401845.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc28742811766dd574c1228ffc239414fdfbf0ef9e596d2fa64e984aca054e8f1. 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/MXUM72502576.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6943fb791cf95bb5202f6cc336ae9a304692ac9d226f4b176f7102c3da8e6b66. 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/MXUM72503078.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf093f95a8d824af8e87924967a041970fb1a10076640285d937c229fae1b0717. 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/MX3741500139.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd92355f81d10d8eff0c9d314d07d4cf5259a2e25a011109ef5adfe4523ee5149. Chain 2 (Bitcoin): anchored in block 959118 (2026-07-22T10:01:58Z), 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/MX3741500140.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35cf7148aa18ffa34b9bc5bcabdafa25eef39fa8d84890d9025a142cbf23700d. 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/MX3741500141.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xacd71da09f3b8b25d0802b2ab488d2f60e6d6b5f428ad0cbc537aa6c175a2649. 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/MX3741500143.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9d8fa5c3dc48e6d257b1d47118e9cffd983a14caf9d10c8a1509fbbe0e02d1f. 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/MX3741500144.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xebf181c3abc25b33306958d448dc9321f95e415652113b56594770b31a7063f3. 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/MX3741500145.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0154fb1ba0b42dda946fc7d5f971b63a3d219fd97fc712736c50219c2d21d48a. 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/QMBZ91710184.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0707a69c895da9502a6c12142bf2490b43cce077ef41c68ed700cc6d0f9df048. 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/GX3Q92110565.