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 0xcaefec81db911a299f24fb205134b3b32c17e5c49eb88234a50ccd10cf49b7e7. Chain 2 (Bitcoin): anchored in block 953786 (2026-06-15T12:56:12Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/d9e79426-9288-4ba2-8d7b-27e277dadc7a.json and https://artists.proofprofile.net/proofs/artist/d9e79426-9288-4ba2-8d7b-27e277dadc7a.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 0x9b1aeb0beb822defd20125e48b4092157b2850c72078031eb680574285717a2e. Chain 2 (Bitcoin): anchored in block 957766 (2026-07-12T22:25:04Z), 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/QZK6K2539281.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa05738331d83569450f9a743bdacc0d570ea62384871a409f35708c83c508f79. Chain 2 (Bitcoin): anchored in block 957788 (2026-07-13T02:37:37Z), 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/QZNWT2511934.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6c53afd36567c04508036cd246b0fbc1f8527f912fedbf654ac8f9d399901c7. 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/QZNWT2511967.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcae6eb0a11ae538937627ed55c3754388b91b448f9d68df07224f094b6386fa0. 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/QZTB82520549.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0bc3f1927fbc54ab6b4f4a573e6ce1b7b152e6d66b3f17a65331bf5be6fd358a. 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/QZTB82520550.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f5ec262cef15b5af81e49947d9e83c335a5548d100c6caee458a5b644326cce. Chain 2 (Bitcoin): anchored in block 958611 (2026-07-18T21:24:44Z), 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/QZTB82520551.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf802c0e18ca08b9d4996f7699f2dc8e5c6b0b16f27688b2a7a874449712208ca. Chain 2 (Bitcoin): anchored in block 958110 (2026-07-15T06:57:12Z), 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/QZTB82520552.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2e774119ea23b1beb9a0ffc05d50ce5755b46e39713e7bc3bc82a21d4a9c1ce. 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/QZTB82520553.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfaebd1ac34d35574624682b336d9806a871a8ae1af9078869fd03d6a9760b163. Chain 2 (Bitcoin): anchored in block 958110 (2026-07-15T06:57:12Z), 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/QZTB82520554.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcbd0aaa6ca9c2740f64bbc48f03091e2451492ced4ba0bdb8f6b290bca7f00f2. Chain 2 (Bitcoin): anchored in block 958256 (2026-07-16T07:22:18Z), 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/QZTB82520555.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc10d4aeb4ac362a7cec3be229c464baff7fb061ac6778736e2a7f3a2cc622781. Chain 2 (Bitcoin): anchored in block 958110 (2026-07-15T06:57:12Z), 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/QZTB82520556.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x852ed8f3ef5b15169d7d7e14151f6697dbd2f9e67a291aca03317d0939d478de. Chain 2 (Bitcoin): anchored in block 958600 (2026-07-18T19:24:05Z), 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/QZTB82520557.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b67c3d830ba65cc899c20b19ba6337b221349adaa05e6852c0bbfbb5cd48569. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T13:14:32Z), 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/QZZ7N2508398.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01aa70657adb0e018b27d1eaf61ce67c63f6d75c58bd257f4a25a57d88f74211. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/QZZ7N2508399.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e5d092ea5e72b50286ce8fd8a1eb47e0772d8ee51def92bbea81611da4be9d9. 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/QZZ7N2508400.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd7180218b1816aa3d54d2dbdf28635f0f711dfd5ece32193129b6751e239689. Chain 2 (Bitcoin): anchored in block 958901 (2026-07-20T15:07:00Z), 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/QZZ7N2508401.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1014ac7a82af68695cb4d624b716832f56717c31412cea4eff7e06e552a187c. 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/QZZ7N2508402.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68d3d8f04631a44365eee587f24fb4d5167a0ea17a2a92e7014bd98e8bfd8faa. 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/QZZ7N2508403.