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 0xbddde83f042fbc5ec41d56ed023b227d77f7cd4f45164358e507c0946e6fa0ab. Chain 2 (Bitcoin): anchored in block 953807 (2026-06-15T16:39:18Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/ef840b21-b471-4176-b9df-c9d6eb3532a6.json and https://artists.proofprofile.net/proofs/artist/ef840b21-b471-4176-b9df-c9d6eb3532a6.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 0x35894db74f0f621e32ece2075ea97f41b9a60334d7f93bdfbc75f9f5de0986f9. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/USHM82437117.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a461c91f9310e5dc7e98f89a28c82ae0d1c3da23a081faaa12bf9d5370d3687. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/USHM82437118.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e72f9fa9cd2bfacce5743f1b35cee9d211d8804a561cd8d25cb83e49ad6999c. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/USHM82437119.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2465dbf0a51338e199c6cc24e90b3dc00ef31dff1f054d7d14f8b041d67068d0. 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/USHM82437120.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc19554012ad5d98bfe0f09da1415c3d7df3af3a269f3e9e01737fce2c70ffe31. Chain 2 (Bitcoin): anchored in block 958465 (2026-07-18T00:04:42Z), 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/USHM82437121.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5087087946342d32298515ad51aa743d2b56ea47d3c58b182cd3acf59fe494b0. Chain 2 (Bitcoin): anchored in block 956742 (2026-07-05T05:07:15Z), 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/USHM82437122.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2d5115fa68b30493cc3bf3e8de587fe1e579519db97f139a78ceaccdfc44d42. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/USHM82437123.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70599015a5f7e051d18c9716763706b075d773a40e4fb705dbe5a828f252370a. 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/USHM82437124.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3cbf79ce4e80a5e46687393a8d8cc5f66c9dc9e7730fca5225630e88f0d203c9. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/USHM82437125.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf5f161bbe86057b168f08a15ec3fb8aee36f98910f53cf32ac81142bd229fa7. Chain 2 (Bitcoin): anchored in block 958476 (2026-07-18T01:26:56Z), 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/USHM82437126.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x802e420900de17f9e00572c57a89475fabfb48acf7b920366e3a0eb15c41391a. Chain 2 (Bitcoin): anchored in block 958517 (2026-07-18T07:54:29Z), 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/USHM82437127.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a3ca3854ef281c1eadc001956e83e5217b814b6cf8eea8c7654c771966a8f4b. 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/USHM82437128.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb33ca0ae64e0572c69e3c0d5c07c26aed0821b70878c80506b6485eb01265c7d. 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/USHM82437129.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8386b1935603ff003cbda883a846dc4fd50d50fc644cb6c2d824ee8915fe0366. Chain 2 (Bitcoin): anchored in block 956776 (2026-07-05T10:59:37Z), 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/USHM82437130.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86b71f591c32a5e343c366d9d06eeee3b32887e29b8b965028ff56fff2916bb1. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/USHM82437131.