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 0x854233960436928f6c9e0c946f9e1a152cf1f12a91d43f23c34bdd1eece7ce30. 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/ff835a15-4831-4be7-bf3b-3ac50e6334a2.json and https://artists.proofprofile.net/proofs/artist/ff835a15-4831-4be7-bf3b-3ac50e6334a2.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 0x6aec975d22d9eb424f959818421f5e6c8f321c404b944c7e555bd8d0cdf62454. 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/QZFZ22103064.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9e0c8afc59cf6bf7b332028725b16bd008047d6bca30502c4d51b61b34110bf. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/QZRP52153880.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x755a3d2ad47e7a5628d80ee7ed86a4f89d102f1474b7e476f49623670afc09a4. Chain 2 (Bitcoin): anchored in block 958436 (2026-07-17T16:42:22Z), 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/QZRP52153881.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1fc693067ec565b2543dda9de262a83935ed88bc1891cf1356097bd7dd0503f. Chain 2 (Bitcoin): anchored in block 958662 (2026-07-19T04:43:15Z), 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/QZRP52153883.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40f540a4d1f8ba62c101910cdb02596c4050c6945ff052134699f1807bf8487e. Chain 2 (Bitcoin): anchored in block 958388 (2026-07-17T09:14:21Z), 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/QZRP52153885.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a8fbdc05994fde8f25cc0f8740bad05fa0ae3b7f821492c48e366e133c01770. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/QZK6J2231317.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31877332af86692e7648030ea849686a78f0fdb8d38801ce5bb9654828b8d5a0. Chain 2 (Bitcoin): anchored in block 957898 (2026-07-13T19:28:48Z), 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/QZMEM2243275.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc052ce293bb5b35c765a5385944c81e7754a29711aa5b196c871fcd08cb0b714. Chain 2 (Bitcoin): anchored in block 959051 (2026-07-21T19:48:03Z), 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/QZTB72246503.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e50f137b86aa21d883067a39ad674b2011f595b55f10c13b54c25ed1156bc13. 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/QZFYZ2316106.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30900bb361d394e165c192a60376655e0ecf513f6bc2ff6ea8bc50cb8f4133a4. Chain 2 (Bitcoin): anchored in block 958388 (2026-07-17T09:14:21Z), 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/QZFZ22388599.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5fa1e7a80d9ec2e40e4214143332a98c14a391188994bf7249675688b49678ae. Chain 2 (Bitcoin): anchored in block 958245 (2026-07-16T05:50:22Z), 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/QZES72320319.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x493d2f5277e5185a19c05666002e1978689f7d001c5d3d7ce02b355d84084854. Chain 2 (Bitcoin): anchored in block 958153 (2026-07-15T12:03:04Z), 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/QZPEW2440539.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0109ac222935adf2c2befad0a28f2eb557218be405039f41816e06414d56425c. 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/USA2P2439929.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9a2e99679bd977cd517090876869c9545563ca794b4b02dd4183af87755dc3f. 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/QZWFK2444647.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4adf85dbd221cf8a9526b66e29430cfe2fe729df0a2d19873b814b89460ae8c4. 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/USA2P2463083.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1a0d25935cfc90b0ec2491f6f5db10657ea44b48635b22e68a5ab76c6527b4a. 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/USA2P2467784.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f5fe1c27603e725896962b29e1148befd346331dcfdf6e2d9c66e681c61a335. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/QZNMZ2441101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x461c3c13cb701b106858dbbc2abd7eaf858890446e939031300bbec67021d75b. Chain 2 (Bitcoin): anchored in block 958541 (2026-07-18T11:37:54Z), 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/QZNMZ2441102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf10c612a1b7013ed2b64c2021a72ca35969c41bd327b2483c668f0af48dbb62. Chain 2 (Bitcoin): anchored in block 959008 (2026-07-21T13:14:05Z), 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/QZNMZ2441103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x874d7510fde47dc68d12a268aa97dc787660f361c727b3b159fbba6a8a1d581f. 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/QZNMZ2441104.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd01eec68a45cc9050281ca164956014796597fc9d9647626c7c6fa774a1098c9. Chain 2 (Bitcoin): anchored in block 958238 (2026-07-16T04:30:31Z), 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/QZNMZ2441105.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66c4f37f7262b7eb2456cb3a82be6b9900db8bab35b217a9f2fe9f37cd7f81b0. Chain 2 (Bitcoin): anchored in block 958110 (2026-07-15T06:57:12Z), 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/QT4K42505943.