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 0xb22ae5f418ce549c3a3464bb309ad744d2eec5d9a2ff456a1f35992e44c478bb. 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/1d53c71b-d3b0-4e61-987f-d7fe8215156d.json and https://artists.proofprofile.net/proofs/artist/1d53c71b-d3b0-4e61-987f-d7fe8215156d.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 0xd5965a1c0b5ac5095493e4e26d58f632890e19017d52716febe9335760b1e75a. Chain 2 (Bitcoin): anchored in block 960456 (2026-07-31T19:53:57Z), 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/QZFZ72276417.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe93553caf04fce5e3f06cbc443f123d54df7f0ee042470f0754ea62a37180374. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/ES71G2405549.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2dd9f3df0dba7a1507bc78c36f5c2a49fca0e8e7f4b1057c134ef134c0d7f5ed. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QZFZ72425712.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x993f527a87950cc1b3771d841f417625de5ccbc0ed2b715acfa326fb4997aa21. Chain 2 (Bitcoin): anchored in block 960485 (2026-08-01T00:10:46Z), 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/QZZ662401340.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x255a9ac2ae1995ebb32c169dff6e32c31605681a15535e881b7120fd84bf3eca. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QZMEP2395357.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x10ad53300503ad828f9da2af5a89ae323dcd95c7b789fa0ecda205598a7ac6e2. Chain 2 (Bitcoin): anchored in block 960459 (2026-07-31T20:22:46Z), 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/QZN882349972.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcba48c06e3a56589c4b3e25bcea73bcee8aec71fa71cde92a39d8ee8d63dd890. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/ES64E2504427.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6e66d38dd6e96dff042a5fe8ed9fafd1876bad02e6a14968e80644b86f445d3. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/ES64E2504428.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa479bfe732f4e1edcfbf4b2b3a742b1984bdc15e64757963a5ac861bf27defbb. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/SE6XY2543484.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36ffc25801817596fe2cc3303011a49bacbe053cc5db7faebd44ea91c20de1fd. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/SE5BU2592341.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96027c07977cffa4f376ba8eca91ccdfbe05930d2f23f1609cd7be69be68429a. Chain 2 (Bitcoin): anchored in block 960170 (2026-07-29T23:52:38Z), 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/SE5BU2598813.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0242925f26ed6013f6d33f3854de027f46edf8f0b42376fada499654f2af884c. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QZHNC2531943.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d0839750c9d349808b831fc51081de5e3b05ffef3c53ca49243230dabccf338. Chain 2 (Bitcoin): anchored in block 960459 (2026-07-31T20:22:46Z), 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/QZES52484821.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63696f53c9907d6eaf2dcd12a1ec69fb7778e390e66d41b0a7301393e4568088. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/ES64E2200251.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe2909f3bd9fb0abb7cb8f85aa8926e150e6c16a99c8e36ea72d18f9f1f114d8. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/ES31E2205418.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac5aebd7983faee61ae9c9125bceb9fbfcf65918619bcdfbe11a4640edf72b80. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/QZTB72297241.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec4ce81b528e3b463c939127c5567fa2ba4aad0216a7c82c48af544a754fb5bb. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/QZTB72297246.