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 0x3db9a8ad2d6e89cdd551af2af734aff87c4df59f3a4d26b17f13b6f6492c004d. Chain 2 (Bitcoin): anchored in block 953592 (2026-06-14T05:36:59Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/02ff89fe-5578-47dd-8f50-c954ec5a89af.json and https://artists.proofprofile.net/proofs/artist/02ff89fe-5578-47dd-8f50-c954ec5a89af.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 0x7c7f62e6398467d59d17afe2b6cbff7818dfa0200de98119a61e3eea1e994577. 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/QZHZ52271024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x333eacb66f49f04773fb97e160fb49825705dba7b2bd8a5aace39e9f406d58ba. 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/QZHZ62292217.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdaa9b50e986b551c8ffcaa9d8ead17d580e0b033e23c6c8ce3fd016a42065d18. Chain 2 (Bitcoin): anchored in block 960225 (2026-07-30T08:04:30Z), 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/QZGLS2212809.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3658024bd0b37da5537f54ec02e88a2aa61e4a5223f3af9c41f9d4025e13e06. 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/QZNJW2274025.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ea16b27a664750af1715e7f921a905d08f4cba6267abccfb08d1bf678ef8b80. 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/QZNJX2254546.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41f2efd21ec29e1fc2e96a7a0010b5ec4a4ef92805f059f041bda76712122abe. 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/QZZ8A2430283.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b27111a4228eb34f216cb344c0e63f96eec0ae6e82bff1498d5112b0fa27178. 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/QZZ8A2430291.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbcf9aa4d73c04f1d9a68c4646dd715a9555f70ba4d456441ccd5484b8bf4b8a4. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/GBRKQ2571078.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf70cb49717681f20864ce53e63902c7bd3c79fd3c28907946880bcc675755afc. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/QZTRX2566978.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf2f32b60cd5e87469da980bf4ff17519ba3a4c4928f9f77e005f47ad4d49a9c. 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/GBWUL2571835.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea1cb65e71d5f444b625aff93c5d0f7da66636eab5ba866fe6e652a6b8d6baa9. Chain 2 (Bitcoin): anchored in block 960121 (2026-07-29T15:22:21Z), 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/GBWUL2571847.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5151963f777743101c9a9d9d13db7f21f609aca3ff6bdf41ba7e3d56de34a46b. 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/GBWUL2571853.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf26dfc329a2fb1028e4afaa37972c4dc668bde388d76c63c59b22d230a859748. Chain 2 (Bitcoin): anchored in block 960203 (2026-07-30T03:35:13Z), 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/GBWUL2571855.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0fc18555d2a821bc9d7907379e47d90f74813eafe717b60ffca295b7d37edb0. 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/GBWUL2571860.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf35cdd8f9fb730aab46f9ec3f588d35fefa01c1b5d6cb5d35728396f3919ed93. 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/GBWUL2571862.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15c532da942a045f7b45ce9b9e4263b3c05781d9418b16ad434c1453380b9e7c. Chain 2 (Bitcoin): anchored in block 960296 (2026-07-30T19:11:09Z), 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/GBWUL2571864.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec6711a36b388b368ad7870f3d7d80ba870295614b18bc5444f0142d3d3149f2. 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/GBWUL2571866.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c937b5b37a9945c8d1202ceb8217156957de1ecbdb4397d638c9beb7c11dfa3. Chain 2 (Bitcoin): anchored in block 960309 (2026-07-30T20:35:49Z), 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/GBWUL2571869.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc28d30bfddc136f06fe32624fc72b5aef0cd1e8c5fe23cddc7423a33cc4bfecb. Chain 2 (Bitcoin): anchored in block 957020 (2026-07-07T09:18:01Z), 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/GBWUL2571870.