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 0xbd755c82c093d463b7e7ed96f29d0b9a9159421f742f27dc3514231f4c1c28e8. 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/66fbf708-97c8-40cc-8257-54e8566ccbc3.json and https://artists.proofprofile.net/proofs/artist/66fbf708-97c8-40cc-8257-54e8566ccbc3.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 0xbec3bc30b012f22ed4d7435454441f4406f2ef95884c5ca9dde5e13edcefcab7. 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/QZK6N2362157.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d5b7bb0c3d7d7b156977bfecf6b5811f25a397e9c9c382a0b56a8c41ced9b6f. 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/QZK6L2386394.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2e758caf2e03b480a9fd79342ba1c2c578b947f613d60385bd11eef6c95e73d. Chain 2 (Bitcoin): anchored in block 959094 (2026-07-22T03:33:16Z), 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/QZMER2312173.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33edf8747450d7939aea003498259f28855a12f9a4e899b7b359f68dafcb1225. 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/QZMER2329830.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6103e605614a3488e4bfe809f144e2fa7c6782996a6a611a686164ae64b9f0dc. 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/QZNWR2390519.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0acfd425e90dcdc1243ea08d53d4f2253489b2f164e705fb23ee39de998eee16. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/QZNWV2363693.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1631d5a9352bc08ed02a8f882f8029a1401cc569066e07d11e6477f173f036cb. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/QZNWV2363694.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f6414f64cde2eb71838830c1fce18dc16ee0c1157b27f9601580a48d9e694f5. 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/QZTBD2388250.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46d05976748a185d0e4024a3cc94d7102ac7c776552bae65be4aa287d4ec586d. Chain 2 (Bitcoin): anchored in block 960503 (2026-08-01T03:41:24Z), 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/QZWFF2306264.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad9a003ed4d696b2054e47f3b0e385330b5bbefb1b34bf2f4419a58688a0dab8. 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/QZWFF2306266.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68f2143ce710382e2665eead3e2a3e2de3f8bf57a7740b31083de78e433409e2. Chain 2 (Bitcoin): anchored in block 957596 (2026-07-11T18:43:56Z), 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/QZHN92481096.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb05a37b57ea293efe4e63bc0dd7ff9986f95cd76703ba008d7705db473b7b77. 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/QZK6M2449079.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60aa8593f059ae5bdd9ac0fe21583118437896da2e6fe5933c7c7e018eb957d2. Chain 2 (Bitcoin): anchored in block 958357 (2026-07-17T03:33:42Z), 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/QZMEN2480279.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54f6fff14b70f2896edfdd8a75519c5265912193ae8fc42cd4388fbd5f01ba6a. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/QZTBD2421497.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x820039b5d73634e154dd0eaf785b96aded291dfa4dcf4be2d79f68d631cef35e. Chain 2 (Bitcoin): anchored in block 958686 (2026-07-19T06:43:29Z), 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/QZDA52530134.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1daf57f55df1e9e94fd06322da4bc1fac750c51a2ea2e59a181df7c704580be0. Chain 2 (Bitcoin): anchored in block 959080 (2026-07-22T00:07:05Z), 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/QZHN42587072.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d27f1bcd453385aba3dcdad55747a9d066f79eac763be5a788427949d0220bd. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/QZHN42587074.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3dee2691fe310826dc8538e5ed886d38f69d290801ac7603adbf7768c90f4346. Chain 2 (Bitcoin): anchored in block 958383 (2026-07-17T08:20:01Z), 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/QZTB42512154.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1048743e477afc57d4deea66abc0f265fd1d1e5c7f0376045469a150d6e0aea6. Chain 2 (Bitcoin): anchored in block 957785 (2026-07-13T01:55:31Z), 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/NL3M12514261.