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 0x44997b40fa7d203b79360bdca1bdfa9bb0b35c60642b1118665ac4580ab801d0. 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/7410be56-93c5-4a63-b100-7eb3e119de36.json and https://artists.proofprofile.net/proofs/artist/7410be56-93c5-4a63-b100-7eb3e119de36.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 0xa04748a1a982b95513422f28fbd70460fbca09b52da9faca269e29a9ddf05aa0. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/CH6542135341.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6eb38580886dc4b92eac490958536841ae4fcc1f3ff09f9785dbe8748d7b4b0. 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/QZMEP2199685.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba44e0f670745e58a937d63ca2c577ef4af09746c99e036ed8c5e63232f301d4. Chain 2 (Bitcoin): anchored in block 960355 (2026-07-31T05:49:18Z), 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/QZMEP2199688.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40ccab9c59fdec977f5800c8e6500bc299f13f0d920f85a49a6d0059cc1d34b8. Chain 2 (Bitcoin): anchored in block 960381 (2026-07-31T09:50:11Z), 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/QZMER2128758.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb0f9212366fab74016fe37f9ab88b63f44dc4aa0537a8ec68e5c0c45016035b. 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/QZMEP2199692.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1163451f1dce6a2a38e98840b84ba5fff3f8997d63225b4df343771a53d49886. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/QZK6N2056815.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ae6a6106ceebed5e484dad6aea67d974fa67bd9af85147c5685e97252d4bc4f. 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/QZK6N2056819.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5422e6c4e81d707b7c77a5ebd3ede3fae0f69bbb4f0a05714b18514ab418766e. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/QZHNC1911152.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3a1d4ba80e5da7ef2364e09ad0ab7893c05d7be33a9e82a59c97e787f2d513b. 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/QZPLR2387182.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6725840ac9472c0c53b08af31463a72531877367a1871c6ecddbbf5ce498a56e. 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/QZPLR2387183.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1862e3cc5041e5d46ffb65f261f48c712194d80795df7aae9b7d2240a6436261. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/QZPLR2387184.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x896cb6821241f9ca47fffa3abea5cb5c4171fc505c661b9a1a98cb8023e594e7. Chain 2 (Bitcoin): anchored in block 960153 (2026-07-29T21:57:12Z), 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/QZPLR2387185.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a7516ca27d7321b532992ec1f621f0ed2773bc9d3eec7ff8e88bc3f457fd40f. 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/QZPLR2387186.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4761e930fc7e2217ff915c756b5649cc86ce85976a1db76854eb5e3043ff6422. 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/QZPLR2387187.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x937d2309621a8fee0e117b4412e89aaac9f8065ffa1e6432ac24ff630e6057f4. 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/QZPLR2387188.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f6c2a7888a0b02c79bd20dcd4447bb4d74656ff5bc4c019c98bfdc10f5ce96b. 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/QZPLR2387189.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d1ea67e98243b6f888e7d64c685e1efa6482b85e35f01ffa1b7d5083b96d09c. Chain 2 (Bitcoin): anchored in block 960220 (2026-07-30T07:28:30Z), 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/QZPLR2387190.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7d35dae2467f3a5a7822c8479c2990ec172d8789ac9076ddcec05a7b2e40936. Chain 2 (Bitcoin): anchored in block 960294 (2026-07-30T18:46:00Z), 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/QZPLR2387191.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2331f3f577a9ccba673d85fb1a4a49067b1541b326d5f42ad6f19b5d5270837. 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/QZPLR2387192.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8857643ecb0ebd4c690cdb43f295dc5d04b7f6962a26a36e1488efb15adab206. 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/QZPLR2387193.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67e7b97581fc14d29b1b098396d0024d09962d1c68c363ce033580f66fc1ac33. 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/QZHNC2362621.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9385a16869eca5679249b3f5b1e204c3a2560d672c084fd0c01e8588a1e2b4dd. Chain 2 (Bitcoin): anchored in block 960407 (2026-07-31T13:26:30Z), 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/QZHNC2362622.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d8758f1632d1478853ba5e4c991e78551c0fda0e2b8b63e7ad004950d01e6be. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/QZHNC2362624.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f0adad8b4942e4ed5cfaf909366d85af5f5be64f2143960655ccdb37e82dedf. 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/QZHNC2362628.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x216fe18e1357c755bb08cb449be7015874459c7c55095bc1a3e5f32514b1dd4a. 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/QZHNC2362630.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x842805d50ffdaf5ab563e77226a03fef3619b88f3830dcb6d952179cab8d6091. 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/QZHNC2362631.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99353d1aca6d5d4d94b60b9265d44700f777161be5b98d2991a202b3eccaf31b. Chain 2 (Bitcoin): anchored in block 960340 (2026-07-31T03:15:04Z), 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/QZK6P2354278.