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 0x88b2da7468ff0f73b13cd000b11b8280cc9ffd42d0486581dde46243c8fe7947. Chain 2 (Bitcoin): anchored in block 954066 (2026-06-17T08:11:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/550910ea-4eef-4bc8-b234-1a61595d6187.json and https://artists.proofprofile.net/proofs/artist/550910ea-4eef-4bc8-b234-1a61595d6187.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 0xb3a4d691dea2aadbd6b32e04622815adf56f1754d413f020ab4460b29f9fa50f. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/USHM82019413.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44734f40673d303697fc7a5af5dd5698716411fd3c862f9382e20202e86a2aac. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/USHM82019414.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb99c2ad7c351c526bfc4a8547bd98d9bb0ff605f6dc1c8226dc6bfabc42cb1b6. 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/USHM82019417.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28b4f2a78e832384c491b4de06e20dc2378014872a9d0f409cca975c0c078151. Chain 2 (Bitcoin): anchored in block 960509 (2026-08-01T04:30:37Z), 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/USHM82019418.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43a30f6244b7a7e81787dbfbaef75ac137c76994e17c11a555a8b04cc73859c8. Chain 2 (Bitcoin): anchored in block 960309 (2026-07-30T20:35:49Z), 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/USL4Q1809299.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x774447aa5b19997f33cb9a0310de880ba40e788252a3964a94aa0cfa8f289f39. Chain 2 (Bitcoin): anchored in block 960497 (2026-08-01T02:22:04Z), 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/USL4Q1809300.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a19f34e3100e9e944dc7f99060a73acb93c74bd0f5840c8c93f656cca1c1d23. 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/USL4Q1809301.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9901e60ea997f227f8449cdde313d61175b3aea7f1c120be6e89627da8732817. 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/USL4Q1809302.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d052873c30588110ef0c4abd62db73047921cbf982d4ceebef94a1417b5353f. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/USL4Q1809303.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30d3af8d4307711506f23454b4c319acf134f72c76f0c676acd1b62f0289a4fb. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/USL4Q1809304.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef3aaa773b35c3e80c4b5e0376ab6931ba5874e9b59f76855a3755cfded7f699. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/USL4Q1809305.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5dc4ed4fd26ec77a0b199c140e9d0bf969845afce5b653598dd8f4a018a5a9b3. 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/USL4Q1809306.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc3b7c3bff2474c2161517a9d489d2973243dae97c13854c6e304d8329278c69. 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/USL4Q1809307.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbfb350dbfc7c05fc4436815785d5e7efb49141587700894acc8f60326becde4f. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/USL4Q1809308.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd6b2e2f20ee7cc15344b6f97058cc199dd0cd0172bf26d2fdd1e14986c137ec. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/USHM21976242.