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 0x1692da648616814516930ee14d2fe7cf3388a878364998b8e6af55c72a8cdf25. 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/e5f4697b-16bc-4947-bed4-cd63cacd2696.json and https://artists.proofprofile.net/proofs/artist/e5f4697b-16bc-4947-bed4-cd63cacd2696.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 0x8982bd72da964b9b3bb94802edb7b30b23ddb79df81e659f450f6bd5f95a152a. Chain 2 (Bitcoin): anchored in block 958716 (2026-07-19T10:15:55Z), 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/QM24S1702511.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x702fd8f8a35aa7d5738f19a7ecbd726ebd22ab14ffdbd566d8d404af59baa7eb. Chain 2 (Bitcoin): anchored in block 958631 (2026-07-19T00:50:09Z), 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/QM24S1703667.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7f69a9011190164b3aeb6b0ef795fe78ce7e1642eff176ecfbef80518679459. 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/USRC11802969.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9dc137e1f33dc86ffcb92abfaa4921c9c958e835e0b487b7f642f7973b8b004. Chain 2 (Bitcoin): anchored in block 958180 (2026-07-15T17:59:52Z), 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/USRC11803514.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5c00d696c24c14a9f8b6fd7cba39666735d8ddd5a5a259e0d5d08e65f540f1a. Chain 2 (Bitcoin): anchored in block 958716 (2026-07-19T10:15:55Z), 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/USRC11902485.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4d3d196027b67bed222bb379596346d8afd6effbd9c3da10ef858a353a1f1b6. Chain 2 (Bitcoin): anchored in block 958415 (2026-07-17T12:50:13Z), 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/USRC11902964.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5c00d696c24c14a9f8b6fd7cba39666735d8ddd5a5a259e0d5d08e65f540f1a. Chain 2 (Bitcoin): anchored in block 958697 (2026-07-19T07:58:24Z), 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/USRC11902485.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe06ba9aa111686f346aa376fed4e2946f00a55f59882b677d5b1ae8854e4e645. Chain 2 (Bitcoin): anchored in block 959015 (2026-07-21T13:52:01Z), 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/USRC11902965.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4677bf40fdb955055f51e2d342eed3b5e20982d69889ade157c4290002408c0a. 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/USRC11902966.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd99cc2e1f64217b9bc00d851f1231fff87dd76640c08e62a56b16d3738a0a509. Chain 2 (Bitcoin): anchored in block 958996 (2026-07-21T10:57:35Z), 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/USRC11902190.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x262adbb1436d89c215d59a6b3ed6053bcff991acc4d4cfed3c8089d65d4ea9f2. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/USRC11903857.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7ad4fadb8a1f8335ff24c4dfe657c9a378c9eac9ef6b3e0d6837e68e163a47d. Chain 2 (Bitcoin): anchored in block 958276 (2026-07-16T10:20:17Z), 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/QM6N22151010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01ef1e90e3ac49fc2fdd09f2d34d8bd5b122c9a8aa820cfdc3eae225ea8bb00f. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QMDA72128374.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x237ce99250bb9b9bc3b85c16deeb172040672cc8b9c22d6c2c9aaab0f91a4c27. Chain 2 (Bitcoin): anchored in block 958996 (2026-07-21T10:57:35Z), 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/USAT22411033.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3698f689a503c5c723de5706353740f369ed66a00e1dbbd9bc650475d2f53b3. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/USAT22411029.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x968c5425e3952bf32e8b31d210bdbb2216e19c19be6961f9562866b776944b7a. 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/USAT22411031.