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 0x8cefcbe84fcd17746bb50ebfc777b0c06b54635fee9e4c15e71c03e0266a9dfb. 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/758ff1bb-5a1a-49d7-9042-5ac4c1b8ccb3.json and https://artists.proofprofile.net/proofs/artist/758ff1bb-5a1a-49d7-9042-5ac4c1b8ccb3.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 0x7ad29313c15df62ba0ea9393aeb66040f7fda0b5efe6037de51fceae5520b2c7. 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/DGA0P2311879.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5abbe238addaf7b979dae411d6e06a7aae93d00e537317bf0879cf29a7951237. 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/DGA0Q2325525.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x325d5b9e4798d8d4ede44edda36dfedf6c26b8108db9b5edc5cfba6fba1b863d. Chain 2 (Bitcoin): anchored in block 958924 (2026-07-20T18:54:07Z), 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/FR10S2436605.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0eb266737c612884496214c94b5680da66fa39914e20199911997951986180f0. 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/FR2X42497009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe68a6caa3a0b314282980dc54842fbf06ef6c8164d5185e2bf6e5e9e81e0762a. 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/FRX282422875.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2e7052574983a208c1358fe21e506004dd6173cc1cf47bd4ffa78fe37e0c3e9. Chain 2 (Bitcoin): anchored in block 958864 (2026-07-20T10:24:04Z), 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/DGA0L2469916.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfacfa275483bf35dbd06b1c3b5cdc023cf9dbad3a0923fb55b41667136cb8b77. 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/FR96X2472924.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8de67b01333ba2065ad7aa58ccae51ae63f1cb4dac13abb4f62b8477c5f8e1c. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), 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/DGA0L2469917.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfacfa275483bf35dbd06b1c3b5cdc023cf9dbad3a0923fb55b41667136cb8b77. 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/FR96X2472924.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e4159499eefde2dc5064d794a1a32f508778b1bbb8aeec996b244b8e4c9494b. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/DGA0L2469918.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79a550389ce041ac21ab1d479b9e6f15ff6ff8a30b4409b1aba8d6ecd5c4c298. 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/FRX872411436.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x657da6ba85c654c5bf1d56d0292605826ba3eed2a1fd233d8f04ad5fc3a55765. Chain 2 (Bitcoin): anchored in block 959001 (2026-07-21T11:41:42Z), 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/DGA0L2469920.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcff61f78d8418b2da130a2dc92af6f12c68e04c22af80322be7ac71ceff0ad80. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/DGA0L2469922.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7ba3e7d35cff55b8049fa063beefcaa5c216c5bce1fabf8bc5e1c0c3109ea05. Chain 2 (Bitcoin): anchored in block 958668 (2026-07-19T05:16:11Z), 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/FR10S2553185.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ea57fa893e7712f81bdbafe9af3e265cf7ba37018e912bdba9855cd7baab958. 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/QMFME2566965.