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 0xad58c61be65da8ef75eceafdf65399118aaf9f9e93dc083d04b5c1bcfa5e39d1. 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/c6098f4d-a318-49c2-b810-d002b196abd0.json and https://artists.proofprofile.net/proofs/artist/c6098f4d-a318-49c2-b810-d002b196abd0.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 0x4444dd699b1274408ba2386fa222ffa881fd8401e36f19a1aca24f47e5453339. Chain 2 (Bitcoin): anchored in block 958885 (2026-07-20T13:01:04Z), 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/QZTAT2152970.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42baee6120330666c250b6d595d9f72c4631ec797cef5ae541c5b5052c0791ed. Chain 2 (Bitcoin): anchored in block 958074 (2026-07-14T22:45:25Z), 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/QZHN72233983.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3e09407f15befc9926052846232cdc8a7dcee74ff3882c6d78f971057bf3452. Chain 2 (Bitcoin): anchored in block 958746 (2026-07-19T15:36:35Z), 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/QZMEP2218141.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e4cb3799dbb8dfe91f6eeb338344323acee42afe768c55b0bb0a9b85d5081cc. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QZK6N2335203.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d0219a8c2413189ccb35f43788f807278ef1595f932bb5c142d591fa088d5b4. Chain 2 (Bitcoin): anchored in block 958263 (2026-07-16T08:19:47Z), 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/QZK6N2335200.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e4cb3799dbb8dfe91f6eeb338344323acee42afe768c55b0bb0a9b85d5081cc. 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/QZK6N2335203.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1bfd3f32dc6a0f91a508a9e7c518f499cf9405ab3ad8a1f8f4238de019ac7f69. Chain 2 (Bitcoin): anchored in block 956711 (2026-07-04T22:48:52Z), 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/USA2P2417612.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f9347aa2ee3e04d600f43d21d119189877b08fde4ac4bf844c262842b4c5a77. Chain 2 (Bitcoin): anchored in block 958825 (2026-07-20T04:55:29Z), 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/TCAIJ2490961.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2e43209fb662b98673ab0cc27bad001ab1bc3ac01ddab6feaf5d78fca20a894. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/USA2P2434255.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65e43919935f93e0bb5bf91806442a37e09f1921d22c8e935ee15d6f9da7ca07. Chain 2 (Bitcoin): anchored in block 958079 (2026-07-15T00:21:05Z), 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/QZMHN2474890.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83af53012fd97c32e9412cf60c405472d56211541ffc64169bbdbc640661e397. 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/USA2P2450527.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc76cc64a5a871a58859beecc6f72668403bb1cc23933df5aa71d323d66884396. Chain 2 (Bitcoin): anchored in block 957750 (2026-07-12T20:39:38Z), 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/USA2P2450127.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf2d0c74f5327d5cdd2e0e03ca12c92ec11f94bef87b32df64e25836067a05dd. Chain 2 (Bitcoin): anchored in block 956637 (2026-07-04T10:56:23Z), 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/USA2P2450129.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5df4f9ce559f6e4f9ef1463ff18fc54cf3389ebdc0049ba36f6639bcebb71b88. 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/QZES92596313.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6e1782122a11c96d7329a9657e992b0b816ebcac865ea8dbfaa40f682735f9f. 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/USLD91753610.