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 0xf70e544099e44414b088527afbe5c76ce02fefd80b964a947f8a4e01918e7b77. Chain 2 (Bitcoin): anchored in block 954066 (2026-06-17T08:11:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/58a737c4-344c-425f-a19f-d20e0dbc62a2.json and https://artists.proofprofile.net/proofs/artist/58a737c4-344c-425f-a19f-d20e0dbc62a2.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 0x4c0dd877b79a6dda6c64f7cbb6d1d1b58c79833f3b3c4559bd9323631fa77494. 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/USHM92201787.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9a1c271e6633f95a6c70bea4a9c71da695596fb29826e85605c426d7d1129d6. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/USHM82245072.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc56350274d7ff5b5779dd87bac16cb45c905d5b82877224ed40d52033b713221. 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/USHM92201796.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9a1c271e6633f95a6c70bea4a9c71da695596fb29826e85605c426d7d1129d6. 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/USHM82245072.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x579e61f2b5c74d52cd752e5f4545da4099889457d18ccf9dc9a6e0005faf3f86. 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/USHM92012161.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28bcbaae311301bd914601e835ad74f92061878a1fd24a24fa64c2ea9160df75. 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/QZKUS2148943.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfff31c8d53d33354d3a408ff9872f32ddfb35419b5e55fffb9ce079ae635b259. 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/QZKUS2148940.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x772d0e811971d69c5091be446d7bb4b720305eb979219fc854e491af03ac29e0. 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/QZKUS2148944.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28aa398d805ef7d630db7c7366bd1ebd43707007af530381f79b046c8de914ab. Chain 2 (Bitcoin): anchored in block 960266 (2026-07-30T14:44:50Z), 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/QZKUS2148934.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a4882ba872d5963c29ce06b66db74e60de9aaf2b4b3ad56411edb51ef30159c. 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/QZKUS2148942.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb19b6c35081b9db185502d577ebd1bd82b65e49b3063f44000b487cc1526d25e. Chain 2 (Bitcoin): anchored in block 960125 (2026-07-29T15:38:18Z), 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/QZKUS2148938.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc963c6d0417f3304d2db7789adcd43f820f8a7029ef29cfcbb8801c5481b8f1. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), 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/QZKUS2148937.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3bb9ca62878e5f756e6b274baa8cfae3337be75954dde2e7bcb8000137f87a6. 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/QZKUS2148935.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f37f9f88e9a8ee41efaa8a9c26e807b6dc840a6650e1663e5b4382688221979. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/QZKUS2148933.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47ba22693cc69880b53053893ff9a3aba160b1cdec85c6c7bb7e57c0d489a56a. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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/QZKUS2148936.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x778484e6c52b7219f380fba94288ae38aac4ca7f8bb3d6d9f0a2bc7118b86347. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/QZKUS2148941.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa438bc61610ff8bc00722964dda47b597edef78ed87e93cf5193f42bbdb7262e. 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/QZKUS2148939.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0d413c82b984b0cf1bd081b5f7c239b3329bae40ffe94de7dc38bdf438b53c1. Chain 2 (Bitcoin): anchored in block 960150 (2026-07-29T21:51:49Z), 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/QZKUS2148932.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc6a660c29f6bdbd87283a6da8a23da19d7ecdef8a7b2abf47c371117f1cf1293. 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/QZTAU2146521.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b2b3a9968f114bb089b68548dd5a6ec976ec3c47bef58a71e66b63784c6a254. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/QZTAU2146522.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b41f031af413dcb58bc51837877c447d572b349fa19674863818fd9128e49ef. 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/QZTAU2146523.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x418a05c2a92d9cd52087140e7d97eef2f8f3d309947199e309d5dd4915744d80. 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/QZTAU2146524.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e8bcc71161694609d53c920965cc0bdff1c89f050931f6eb2d3da618e139702. 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/QZNWY2189842.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1925a875bbd4a391e223fdc87609626c6a6e47ac56bcc21f8abba058b73add55. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/QZHN52179162.