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 0x550084c14715b58774fdab90faba48e7ad991c023b90d5f88922260979bafb83. 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/04b956fd-74e6-41b9-bd82-3eb4d9b324d3.json and https://artists.proofprofile.net/proofs/artist/04b956fd-74e6-41b9-bd82-3eb4d9b324d3.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 0xd5676a8fab01d469d7518edf3805ddf0fac7177ca4a844107be4b218eb62d873. 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/DELJ81467732.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2fb7077e4721ef3f3064ef325dfec0e4a330efdc7e762a47386341d6f3aa99ce. 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/DELJ81467739.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17f5476aa20be818045dd5ebb879e16823d12d3deb3fc4b59351ab9daa43ce7c. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/DELJ81467743.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x993c3d2bd726f3d25baa82c2dd18d594a0ab932b40d963611ec55d0c0a9257da. Chain 2 (Bitcoin): anchored in block 958905 (2026-07-20T16:14:34Z), 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/DELJ81467746.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x647cf94498a43baf57dbcc0e52a0b4886a077e2b4525971c63a4fe4fcb23c194. Chain 2 (Bitcoin): anchored in block 958666 (2026-07-19T05:00:30Z), 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/DELJ81512448.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17f428b8ce6a19745788c4e5ca33d178cdfc8209d6747de3c0f7cc7c54b0dcb6. Chain 2 (Bitcoin): anchored in block 958383 (2026-07-17T08:20:01Z), 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/DELJ81512449.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd969ca72a9eeeb4fd74fb32b5f66f30bbfc770bc17cc6959fd7dcd900d2f89fa. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T15:22:58Z), 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/DELJ81512451.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a72a1cd38e3c9c9dfaa7b9c9505ba5183f82e5c1fc167ea123952aa7ee201e6. 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/DELJ81630337.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83f334561c86e5c59753dee8db3a00d97812f5e3fbd33b0c614878436825c63e. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), 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/DELJ81630358.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb347d585b3cfbac4f58cb1a28af8a316f1f902295c4282f7fcc755860809bcb7. 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/DELJ81742790.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc03a5821540429f39787e16aa4298890485fdae903a9ecf2b19d2d979e2624ec. Chain 2 (Bitcoin): anchored in block 958779 (2026-07-19T21:08:39Z), 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/DEZC62037665.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb99f3c3035c068259fe15fbfb1f53555071ffd5d5a5f36a265304b1f598e81b6. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/DEZC62037666.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1cec73378bb47861c15c98f428d5279863a20dd731522409870cb067ce049ddf. Chain 2 (Bitcoin): anchored in block 958724 (2026-07-19T11:19:01Z), 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/DEZC62037667.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x520332bbd8e4e622b3c86b65d7b890d48cb724160404c09632c17883c89b1c70. Chain 2 (Bitcoin): anchored in block 958726 (2026-07-19T11:47:20Z), 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/DEZC62037668.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x634784ab38139a9e13ee69d300ee4a6d860764f5b4a2ca2eadf3602d7b39cec3. Chain 2 (Bitcoin): anchored in block 956578 (2026-07-04T02:23:20Z), 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/DEZC62037670.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78196cb0892a3bcdbabd3daa9f5bcbd42c03ec4349f12bc7f0aa4a2875c2dfa7. 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/DEZC62037673.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d6ec589f9b0c32918d6388879bbce34f49f0d3a466a1c1f134bf9deee497003. 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/DELJ81482490.