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 0x5a2568060893447d3186cf47725841781b45252024c6466e2f5674c96da316d6. 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/1dcddf0f-7585-4348-9218-5e5f20a4064d.json and https://artists.proofprofile.net/proofs/artist/1dcddf0f-7585-4348-9218-5e5f20a4064d.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 0x065133e657b66135e72aabc11c2f060059855ed6641e2c620f2f3b9788c0517b. 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/PLB381000002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x94bc3993a386f9e12a25c3aceb4386c195564e7090084ab698f8e2298065bfce. 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/PLB381000006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd549582b5bd41ff2a25aa9f4615fbc7eb5fc36d66c09e634ef645d299e1bc86. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/PLUM71200866.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37836918d7860f881cff9bc4df0db3a190b0e5f1a68c135d34d36d6583af7792. Chain 2 (Bitcoin): anchored in block 958324 (2026-07-16T21:05:52Z), 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/PLUM71800289.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb948b0a1ec5c589ce9706c52a8a9d4e62e6bf03ac031b1aa01bf52712ad0e5c. Chain 2 (Bitcoin): anchored in block 958771 (2026-07-19T19:27:18Z), 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/PLUM71800326.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5934b68880aeb46a48018fc2f4d7b6972f527d3af8f86eb8a139422d8f3abad5. Chain 2 (Bitcoin): anchored in block 958746 (2026-07-19T15:36:35Z), 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/PLUM71800337.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a50ba67afd6fa96a098221e26a9bd99a57e18f2aebbf443d42aefc9bc0d5254. 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/PLUM71800353.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa04890fe9a42e7a473e9bd75b455426df3695f54953261e7372a77e0fa3b838b. 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/PLA812120042.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ec5ee4b8e7486c9c7114b24b6c9616cf13de6486020f2214bd1c0b4600c4a01. Chain 2 (Bitcoin): anchored in block 957880 (2026-07-13T16:39:18Z), 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/PLA812100043.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62177331ba1fc04ce8636a2a234594efe707aa7c051884ec8336b99c99765412. Chain 2 (Bitcoin): anchored in block 956745 (2026-07-05T05:33:35Z), 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/PLA812100044.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1070a10506575d1324b8654a95ad8f51f76fd3be244b2a5b24c6baee7c3ed3e1. Chain 2 (Bitcoin): anchored in block 957880 (2026-07-13T16:39:18Z), 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/PLA812100045.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x128c19ce5760010d90960f940dff5824c5b3040b36b20233b8c6ae444d640361. 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/PLA812100046.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1c47502d9a0c470f625262b23c9731b553ff0ca89a0565afa2b3d6fbabfb9b9. Chain 2 (Bitcoin): anchored in block 956745 (2026-07-05T05:33:35Z), 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/PLA812100047.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22e164040b66d9975e27d486c26d2c3825d7d64374d3756422ab85ab87d0a75d. 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/PLA812100048.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c0ee86787ae4d0504c3f65db85271e716ba549582144feb0120c790aeef20aa. 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/PLA812200055.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13bec4768b8bc9ae75e2eddc089cc434e1754bf0cf8abfb9247c1e0d926908fb. Chain 2 (Bitcoin): anchored in block 960317 (2026-07-30T21:35:24Z), 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/PLA391145911.