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 0x163b88159ba0a295061d80bb2f31a628cb44baa9942617a648e6f6c2b5aa07d8. 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/06bf725f-ff8a-4667-a348-e5bdcfb5ded9.json and https://artists.proofprofile.net/proofs/artist/06bf725f-ff8a-4667-a348-e5bdcfb5ded9.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 0x54a46b69e828c6e99ddcb1be8219a86b709e3023bebda54cb69d1d3b0a8c99cc. 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/USQY51229277.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57648f639f5220d7f4fd5de8d0b7f53a797b0d5a5c0dc3d71c0b3d0b8a339a9f. Chain 2 (Bitcoin): anchored in block 958959 (2026-07-21T03:51:22Z), 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/USQY51229278.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4ad0e7f415bba02e89a560b97310756e43f0ac821641e3296b83fc60b421f25. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/USQY51229280.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06fe60693678c6ffc062c1239819c0f5deb6e1143e59d7b985397f7f2de62303. 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/USQY51487826.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc263e7b435429d78058245a1d2ef8bc357c11cefacb396da22645575930f645b. Chain 2 (Bitcoin): anchored in block 958911 (2026-07-20T16:46:31Z), 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/USQY51487827.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ec82725f1b0beee991af7f9238b3bf9a5fd3b456f7fc3602f6e8a37170c0f78. Chain 2 (Bitcoin): anchored in block 959355 (2026-07-24T03:24:16Z), 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/USQY51487828.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b4cf082810bb6495473d8d4fac74f0eedd2e722c8927b86613a55333e121de0. Chain 2 (Bitcoin): anchored in block 958468 (2026-07-18T00:27:51Z), 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/USQY51487830.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2c94ecb85d3ffe585a1c33ec03baf15662be99fccfaad7227088050330fff8f. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/USA2P1636232.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ad9ae73210a5423409a5307bce8ef0ba68aef029ed03855e87844735026394c. Chain 2 (Bitcoin): anchored in block 958137 (2026-07-15T09:47:57Z), 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/USA2P1636235.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d234ad9e280bb1e552d0ad986841ea753257247f0e4f3d5cc3e3dd50196db82. 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/USA2P1636236.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5da6d0fa1f5bd1e5a2490a3e108eee510c99b903f03f853dbe5134ae35c21686. Chain 2 (Bitcoin): anchored in block 957888 (2026-07-13T17:43:59Z), 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/USA2P1636237.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9af96e2046ae53e403388d6e38cfa43bfc35b5b8e01b38dd9cb719696a6a5dde. 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/USA2P1636238.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e2ab4de93ed9c11bb88ec647c9d4e3d1a01279695fe8525b0f1077952265457. 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/USA2P1636239.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe15cf3b38570b71a2fe7ca8fa98b72b34aaa865fa1d0d664706a9a5f8247db5d. Chain 2 (Bitcoin): anchored in block 958736 (2026-07-19T13:04:09Z), 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/USA2P1636240.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x587dc25769978b4d22e0fdfffb1af54964a8679ce1af42876e9db97558625b00. Chain 2 (Bitcoin): anchored in block 958853 (2026-07-20T09:11:53Z), 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/USA2P1636241.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90d5490cbc7c64ebf0f704030a0adfcbee4e58bef89de096b684018eab413e9f. 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/USA2P1636242.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf24f1797078a0e779143c24159b5b882204b8ccd234138be50cc29e6508c503. Chain 2 (Bitcoin): anchored in block 958805 (2026-07-20T02:22:58Z), 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/USA2P1636243.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb519f3209d258d08c788b6850266823d9d6f325a68af16d1862a3595c2a5e23a. Chain 2 (Bitcoin): anchored in block 960354 (2026-07-31T05:48:18Z), 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/USQY51515216.