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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 0x97486f1724eb86a5ba7d185d3517fb5f2fa1784469ca65c029b03c11f6586124. Chain 2 (Bitcoin): anchored in block 953588 (2026-06-14T04:52:46Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/0139c3f4-e5e6-4f43-b5fa-0f08fb16218b.json and https://artists.proofprofile.net/proofs/artist/0139c3f4-e5e6-4f43-b5fa-0f08fb16218b.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 0xbf1e8590223d165a7b6f3f6e261ed0fdee0a8e4464f90926b6bcc4b5506743ac. 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/QZRP52157747.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69a0baf977969f76a3d861c4a608031cd9b039f44aae83fbabac2a23b2b90229. 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/QZRP52157748.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9126371ebf340f98418b8c12221984d953e82fafabea017ae18bbd7af79e38f. Chain 2 (Bitcoin): anchored in block 959163 (2026-07-22T21:00:17Z), 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/QZRP52157749.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x393fb1034205b22fa9f5deed1da694dfbf5827a9e66c76b6d33f158a2a356a2b. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/QZRP52157750.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x045c1fb21131745ce400881505c153afbf8194600494d10eecb88a05fc4ccd9f. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QZRP52157751.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3b384a6bc2e0fed2ac2981ccd7c34ae52b5af50fc785811fd865be98a32f750. 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/QZRP52157752.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d4a495a45a446f1996e130141311f2cc2132171b6fb81bf428c79b0d213f1f4. 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/QZFZ42553769.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a7f2925388267a578e1a798676a6d1705bba7ed933597c925d6f757612f339f. 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/QZFZ42553770.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc24cbd438791dc4ada320b2d20e317210783bbeb40fc446135d3c3ca696f6c29. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/QZFZ42553771.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d0547423737d3a25c239cedf384f67f12186cad4c9299327c089a6c09bf5407. 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/QZFZ42553772.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34160ba2a524d4aeff4a579fa241fe27bc865f1324e09874e57046654985f0b2. 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/QZFZ42553773.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x94032ea94e5662be7165ad68a21c63254f76e2b7df504205d4b4f676c23e4059. 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/QZFZ42553774.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf84a04587cb257ec235530efde39d37c67d628868459283acbf50e17ed61ff03. 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/QZFZ42553775.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1a8f46b5c4dd9f54799772b6e3b22f0712d3c5ce19d31c271e3e03ff24ac2d9. 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/QZFZ42553776.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb781053d8d6d82f8e8f11d47b033b294bbeecfdf9e8f61a40427036af3105427. 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/QZFZ42553777.