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 0xf757fa3b594de763fba37d1c0122c5f1cc3c1497f0701f466db4157af2bda4ad. Chain 2 (Bitcoin): anchored in block 953817 (2026-06-15T18:10:31Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/f8c5adc7-6e1d-4927-8be7-4951b5a55470.json and https://artists.proofprofile.net/proofs/artist/f8c5adc7-6e1d-4927-8be7-4951b5a55470.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 0x46770fc720bec44b8ba27b4034f3bd66ae75f8f2d0256b9ca64aad09811c4b10. Chain 2 (Bitcoin): anchored in block 957668 (2026-07-12T06:54:37Z), 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/DEAR41434436.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x299ff674a9d05b2786e0ca3aa1175a223d4f240475608549c2a87e6cfb95e055. Chain 2 (Bitcoin): anchored in block 958484 (2026-07-18T03:34:53Z), 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/DEAR41533941.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84dc5b7c1350718162f5ac71df6b3004efa750450efaf61b8654ff6664be6698. Chain 2 (Bitcoin): anchored in block 958484 (2026-07-18T03:34:53Z), 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/DEAR41533942.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f077b507ab15539dfa73f49adaf1238d3e4921b203b28759fdab9d8bf52cde2. Chain 2 (Bitcoin): anchored in block 959137 (2026-07-22T14:03:35Z), 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/DEAR41533943.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49173747c9ed6f2b379eb6097dbe20e8c47f64e541d17d832c16a2ed50184e12. Chain 2 (Bitcoin): anchored in block 958060 (2026-07-14T20:39:42Z), 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/DEAR41533944.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb67ea3dfa753b4a4a011ce925dbe0cc2cb0ee25e95c87453a9154b010dda7917. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/DEAR41533945.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9cb0b70159cb482ece49922d93f338aec362fd7e4160c4003fda6f2caac3ab74. Chain 2 (Bitcoin): anchored in block 958775 (2026-07-19T20:13:58Z), 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/DEAR41533947.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa18b7f5944e5f3d3b8c8e4757c6b72e8bf1b14c897255bb9b1cb992bf5b25c4f. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T13:14:32Z), 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/DEAR41533951.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc27b9b80e33441e4066c5019665eefb208b9831f976b8b3a0751ad852bc03f11. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T08:41:42Z), 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/DEAR41533952.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b991940dd1285f905e3d4de827257135768dfcfc34695d2edbb937a407c2aac. Chain 2 (Bitcoin): anchored in block 959065 (2026-07-21T22:00:50Z), 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/DEAR41914580.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50a7f762a0172845152e223f3e38cd240cac3624ab71f73c702caa2224036ae3. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T13:14:32Z), 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/DEAR42027765.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a75ba9471ffa7d977c64ff37892add84dc3b60f7feabd93560570f1bca0d598. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/DEAR42095869.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c92a6ed88e1f42dc3872312f24e427f8ad5cb6a335c4f8a602e6fdd66736e36. 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/DEAR42136664.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x557bb0284528d81ec26bbd56eb7127786a5bf48591380a9bfcc58a1002c0d5e5. 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/DEAR42142896.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb02be2743eb7f13e3116118dcf1b5f8de731c55e1a97a8de580e062858a998d9. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/DEAR42522240.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbaf8e7324b9b3f6df07f050071546a4f2f47e2193ed64f228e0a82bf5e9166be. 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/DEAR42513715.