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 0xbc15d57187d5736d47f36e80e1d88c89f633b64061de364bee48e14b6882c933. Chain 2 (Bitcoin): anchored in block 953694 (2026-06-14T21:38:09Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/70512b59-6736-4267-8bfd-5aab84f9095b.json and https://artists.proofprofile.net/proofs/artist/70512b59-6736-4267-8bfd-5aab84f9095b.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 0x052e5f3313e2479781f13b8e4e84c871486a9f2c8f9273fb6fcb1f4c6771c2f6. 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/CH6542317158.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13a989419e9f060b04c9e38de4c55580d2dfee3eea0e0bac0d7affe513f26e0d. 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/CH6542112754.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4806e041f94f552ba09c907eec6ee412d3ad3289412a59a5c79562dd41d25761. Chain 2 (Bitcoin): anchored in block 957820 (2026-07-13T07:54:01Z), 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/CH6541640631.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4074177a8ac1f2d71cb1e000a3d40f71b190d89b7ede443a5c88ab11ac428681. 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/CH6541652860.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee86599cb161970a871be2ffdc2062ae611a871335b33f0895cb0da4500ff8c1. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/CH6541652858.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78bccae7c62c5591a32dac70736bd40338d1a91cfd374cd00752dbfaa123a2e9. 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/TCAFR2121101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x821c2aadcfe59dc2b662e404b0a9ea5a8a4d3c61d63717177b0d8ea21b66521b. 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/QZJG52482779.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3cdc17a09d6733c942df4d04b2f4deca68de23ec9e7fc7cc3a69629b273d8e3a. Chain 2 (Bitcoin): anchored in block 960497 (2026-08-01T02:22:04Z), 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/QZJG52482780.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6e364c8dc8b477c1dde84e357f2cf029a22edab68c53c2261da79c886b2025d. 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/QZJG52482781.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f51fce8d91a968ceafb8c51a2b6df0d4c7b85c6faf1fa75e99947aa1261cc21. Chain 2 (Bitcoin): anchored in block 960355 (2026-07-31T05:49:18Z), 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/QZJG52482782.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52004bbb8a6d4c3e6a2e86f03996f935d543c350c2f4b427094440b1f85dfd13. 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/QZJG52482784.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc65ed7aa048ac41b17e61af61bf404571951b9d7dbbbba5b19e9a218219aac74. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/QZJG52482788.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x250f2cac46c39c863a8edbb22d309585e001c25033e4b5db4b9984874e07721e. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/QZJG52482794.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfbe2430e7fd794b5dbde00e7095926a841b55b2bf820c471352441a23a3ede1b. 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/QZJG52482801.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc62117689f12958db03f32e576dd060e44acadf62fe6ad00d6e652ea3110d8e8. 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/QZHN62438015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x681cca7c5c97a6e79785ee6b5dd8bb9d01b981294f90494aa9c65cb7f419256b. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/QZHN62438021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ff6d2a1256d67e9ef54f7c015c4b6a7da11b0c2868a5160ab6920a55e1ca8a4. Chain 2 (Bitcoin): anchored in block 960497 (2026-08-01T02:22:04Z), 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/CH6542175903.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x847ee2e970870bb34a335b56861af99c18eda660a2f651465ff3b6de60f0f208. 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/QZMEQ2326394.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb00cfe7a37203dce800ebc0025ae32c061664825ed3972123fc55ddbb08ed492. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/QZMEQ2326395.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59ae5323c9b152af9c684b48ba069a5546eedb868bdcb5156df21827c284a51d. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/QZMEQ2326396.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e3edb60f61a100d8b5e6efcf9fd440f8e23a35cea1dbb2f845d86448a6c123e. 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/QZMEQ2326397.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe834a82f487cb9e9f668a671e61c9c3458965086a19824d3453fcb6f9211c9d9. Chain 2 (Bitcoin): anchored in block 960362 (2026-07-31T06:58:00Z), 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/QZMEQ2326398.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c426a5b0c6c6b6605c812baf5367be42f94d5e42e7eb5a4b2bdcbdd3ba1b801. 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/CH6542292370.