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 0xf1b3404431b944f9d9d670f31a404d6425c071b0a4f70cb74e8c392a819a1d9d. 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/181adbfc-abac-4421-9431-1a21f79cc884.json and https://artists.proofprofile.net/proofs/artist/181adbfc-abac-4421-9431-1a21f79cc884.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 0x8d282b321a05b3ad736bbac8eae07c76161117dbe5e9547c570c0a036428a840. 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/TCAFH2002963.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1c5538eeb91b7d37126678c8de7fbf0c27d37e1c49a9f79760712e5b4f096fe. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/TCAFH2002968.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9dbd6a36ed77dc6e0fe6c062db47e5753cdc91cd2371ec979eb067b2cd8ea563. Chain 2 (Bitcoin): anchored in block 958517 (2026-07-18T07:54:29Z), 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/TCAFH2002983.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93b3775aff0a0ec95540691421aa8ef4838061eccbfdb317f769471dd022605f. 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/TCAFH2002986.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5daf2d075bcf0c2a9794be63a212c763a0db6f1437fd294edb028ee0ec6525f2. Chain 2 (Bitcoin): anchored in block 958980 (2026-07-21T07:04:12Z), 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/TCAFH2002994.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86d65445c56ebd5afa3167ec5a1162777a66d2e51a610b3e6429d8c6e33cf57f. 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/TCAFH2003008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5d894dbe834a4f8f63bd6c887d6212ec1a068aa5dec857c6e6f82e2e4d0a6a1. Chain 2 (Bitcoin): anchored in block 958146 (2026-07-15T10:33:22Z), 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/TCAHD2357356.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c7a4494eeb5d405eedb6e17237b1cec0753a55119d537f47be2d9435f9e437f. 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/TCAHD2362854.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb2ba2bf12b99c5a54249914afbda5151bb7623c245d3c04e61174d86e25db28. Chain 2 (Bitcoin): anchored in block 958612 (2026-07-18T21:29:37Z), 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/TCAHD2362857.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b652cba1162c57d095669630c3422c1bbf9028cc6f26ad62a5b958ddbb59615. Chain 2 (Bitcoin): anchored in block 958153 (2026-07-15T12:03:04Z), 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/TCAHD2362860.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0a48965aece6bebd3415e4a447c3bb7690b921ab03f421f553ce69749d3eda7. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/TCAHE2345613.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb308bcc05696a209249b634cce5d781f7d3d96e918be87f6af4d89412db95b6f. Chain 2 (Bitcoin): anchored in block 959002 (2026-07-21T11:47:29Z), 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/TCAHE2345616.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa35a3e46810991a32a7e73de0da94a1225d35670a6b0250bbcf490b5b4224b50. Chain 2 (Bitcoin): anchored in block 958399 (2026-07-17T10:39:51Z), 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/TCAHE2345644.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc42cd36002acec2414a11a2f376923bf704d5ef7145b3d59865f93cd50ebe020. Chain 2 (Bitcoin): anchored in block 958357 (2026-07-17T03:33:42Z), 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/TCAHF2382253.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35d0da3dcb140ae2155181bd373e6ead3b8c97db4a43e1524d2f32ad5c55c888. Chain 2 (Bitcoin): anchored in block 958104 (2026-07-15T05:34:05Z), 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/TCAJY2591354.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ceb8ecab114822336b47addc5679ba7374a0e51065555733448ccd9063d45d6. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/TCAJF2597566.