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 0xc2db3c41038590a29bc2b8a0d2a0576faa4844d5a154a7260d79906c17232fbf. 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/8ae65e61-2e50-480f-8ef7-d286e851bb43.json and https://artists.proofprofile.net/proofs/artist/8ae65e61-2e50-480f-8ef7-d286e851bb43.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 0xf864d1cb1a3b75242052a3425e17aada1d8472de1039a2c73c4431eb394f4bb8. Chain 2 (Bitcoin): anchored in block 958388 (2026-07-17T09:14:21Z), 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/QZFZ62242349.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e7fcf0e8afeb3493ae3089fa606347f174d91345b5288ffb6b9ba51c7a71100. Chain 2 (Bitcoin): anchored in block 957569 (2026-07-11T12:44:25Z), 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/QZFZ62242355.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd642797c9ea1a07bfcc46f28ad76459fa7d45d0e4e1293dc93bd0244267e7f40. Chain 2 (Bitcoin): anchored in block 958058 (2026-07-14T20:20:34Z), 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/QZDA72276881.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc754853b3ceb35313481b17856eeb94df308df5d83f4c628ab70d095937aabb. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/QZHN42251822.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf248535c6b2476f681505d9ccc408ff22f829d1fdf105c5cd4ed3ecd58e7d0ef. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/QZNWR2218294.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0490d1aaa683e12f39c49b858975bf310e8422670794cc86044919d686d10735. 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/QZTB62218881.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84d4eccfc00ad9940f6d3f958b5b9f23f36dcc069e2a778b31ae8755e61a7a01. Chain 2 (Bitcoin): anchored in block 958473 (2026-07-18T00:52:36Z), 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/QZTB62218882.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc317a3b5f89785df48dd8dad47331a0fe87f8cfb27ced41bab3a7728cf5e1d2e. Chain 2 (Bitcoin): anchored in block 958918 (2026-07-20T17:58:04Z), 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/QZES82376923.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3999deda7aeaa5e2fc3f5b126d56f241b8d3880fbe67065cad96dd22b673a32. Chain 2 (Bitcoin): anchored in block 959058 (2026-07-21T21:09:36Z), 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/QZK6M2358513.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed0f82c95119133cf9161ecc8559d614d41a2d02e2507033960c733945c20f4d. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/QZK6H2311252.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b742a17d770b1cca574632aa9640880941390a217dbc80483e01d9ce86d6291. Chain 2 (Bitcoin): anchored in block 958867 (2026-07-20T11:08:30Z), 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/QZK6H2311254.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5059bf702c39e85c6f54f05c3371505d8526003504e80cf9d6feb43acc46ade9. 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/QZK6H2387283.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76de1a3aeb25e7d67e5da5299a2fc2d84ecd8cc4914636948dc94e63e224be14. Chain 2 (Bitcoin): anchored in block 958913 (2026-07-20T16:58:47Z), 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/QZK6G2400098.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4cfdfd944a201da5ec60979028f55b0f7b5679f3e2531a6ee65a3b9da4614ec3. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/QZK6G2400099.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x166c826cbfb5384b7429ce1d32671e59c5bad46e2c15f918df645f17574d2d26. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/QZWFK2450687.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9dd6d6dc6862b1dae7ffd4d3d1780b5cbf40621f6a823567df441d5b6dd2857a. Chain 2 (Bitcoin): anchored in block 958473 (2026-07-18T00:52:36Z), 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/QZZ7K2465956.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ef37638a3203302a7f90f9f21793cd3a4e115fb9a37988e0e784413fffd9408. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/QT3F22467375.