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 0x9e412fac4d656924b7455c14e1a1e055414f6b5fc05a03d79fbf95837313bd3b. Chain 2 (Bitcoin): anchored in block 954667 (2026-06-21T07:29:20Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/dee1559f-8d12-499f-83c7-3ea0f8ed29ed.json and https://artists.proofprofile.net/proofs/artist/dee1559f-8d12-499f-83c7-3ea0f8ed29ed.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 0x98d486042accb83d66d46cd682a3e6dc261685b5a3db024b0d212ae3c2063e08. 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/QMDA72160482.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xedc88f066453a20489370b1d4fcd867ef24d693fd93b9d6db9aada51b8da60f5. 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/QMDA72160481.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x410fad5c6e55842c34eb9fe5e1b1be732dbd45e1ac6888423ba722f6e2b24706. 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/DEZ651365689.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6074625c3b3996717633d00e1508c1692bbf0ede3582d8bdf548a252d9cf8067. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/DEZ651361072.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50a1d634cac92c494bfb608f410effe8b8a0896f0b15a3e135c07426ea2eda15. 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/DEZ651370106.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4d3eb414b779be9bba69f1baa3311da54fe20db86ddff5008b18583b2d7d41e. Chain 2 (Bitcoin): anchored in block 957050 (2026-07-07T14:41:13Z), 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/DEZ651601819.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x889e17f6022447f986794050109063c31dd0c05096752938d78160aba09455bd. 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/QM6MZ2224152.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xedc88f066453a20489370b1d4fcd867ef24d693fd93b9d6db9aada51b8da60f5. 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/QMDA72160481.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf118a39c7c3a18223ddda4aa9a1148569cf2414d09582dbb00d94825f704a6d4. Chain 2 (Bitcoin): anchored in block 960095 (2026-07-29T11:07:37Z), 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/QM6MZ2224154.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x117cc2d17eab05479a1be47e9316228bfe85ba0d5b03a80046ef8d2bf3d07a4d. Chain 2 (Bitcoin): anchored in block 957050 (2026-07-07T14:41:13Z), 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/QMBZ92182839.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2f9ec8bd743a5dd77dec5aaeb468320b68309b7d5b5dc0f2733e307b2e2f182. 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/DEZ651361071.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e5641214e33e5a0213487a14778fa907ed1d92b3defdba938893567c66d201e. 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/QM4TX2224680.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98d486042accb83d66d46cd682a3e6dc261685b5a3db024b0d212ae3c2063e08. Chain 2 (Bitcoin): anchored in block 960258 (2026-07-30T12:45:34Z), 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/QMDA72160482.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb746ded7dd41c1ddee7bab8ce3195548a505ee4a9e9d84498b5f56df459af48a. Chain 2 (Bitcoin): anchored in block 959163 (2026-07-22T18:47:29Z), 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/QMDA72160447.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x14bbe43468f4e343b00d7d97f2e98301412041ae5a30ad8564f5550172dee136. 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/QMBZ92182840.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5bad515894e65a5e03710b504dcd622695cf709455e17beab836315008a75374. Chain 2 (Bitcoin): anchored in block 960288 (2026-07-30T17:41:38Z), 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/QM6MZ2230313.