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 0x3168ff6f8696dc5fbbaaeb98371df23c1cb8a03a5b61f9114c6ea40510480b93. 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/12b2743e-cb92-461a-ac33-59246c2a8fca.json and https://artists.proofprofile.net/proofs/artist/12b2743e-cb92-461a-ac33-59246c2a8fca.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 0xf3c1abee02cfa2113a88c825241b50e9c527318bc9055600e14bd4ff254aea78. 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/ARIXB2311564.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb722a950653aeefa3304bce43b9035e8e80c0abda9a37ff426ebd7212271c6d3. 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/BK4DA2327236.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5f6b037378b3cb6a6006bd66518f0034acdbb0aaded3847612ab7e10b9798ed. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/QM4TW2100690.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41e01399c168ad5e0e808ab08abfa23b6bada12c68dc051c22692c977a74c194. 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/QMBZ92011112.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9926fd0d30de5352a3910219d95c23b3b2a6e80dbca22bfe18df2bab827af1c4. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/ES71G2306732.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x962c8787cdfaf4d4496c17d7842c30a3219424f9cf779d7508d532eff9668630. Chain 2 (Bitcoin): anchored in block 959138 (2026-07-22T14:10:55Z), 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/ES71G2213174.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ff2606db106c83b0c50b7db17c59cee02270f39a1285eb104d87d05cd37fa74. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/ES71G2412053.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x454a8a1f089bfaa108f85f51dc127d4ecc16dc4b53dfae553b180366f803086a. 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/ZZOPM2223017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57ee64897c134a7747f5f41b6782ee6e867a793acbd6e90de48b17687367929f. 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/ZZOPM2223054.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e93e3463bc3c61ae25305676fb4ce6edae3d3ca9457b1fdbd03918b55dbc842. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/ESA011874712.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb60054aa78672a9f15e76ac874c964bc6b5d0431b12428d233350b591a6e7ed. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/ESA011756578.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x880257903cca2d43f13a72882976654b8be50a012d23f15d74b4ed21eaa589fa. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/ESA011756579.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ff115783c12b223d5879204be4d58858ede6d9a94644fc08a2db32b310cfaa3. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/ESA011851499.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96ae7c21a387f9d82b686f13919d7ac5aacc0b74db4066d0d6cb5ada720b3316. 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/ESA011756580.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6a7cde08393f0d7a121ca81ca187a3ccc1363d45a0e1b4de67775ce97582861. 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/ESA011756581.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe93c1900b58367897af0d0d8c4e8193ffc9072a094a84a41b5ffb652c7249e52. Chain 2 (Bitcoin): anchored in block 960203 (2026-07-30T03:35:13Z), 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/ESA011756582.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3851b1bc5514369b456010dae2f034cbfbc8a3c1d506048363914ad744c901b2. 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/ESA011739810.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1bd0e1c9a5a1ba86212a269e672707746a0533bb1a3cbe6e25a0b2031a342272. 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/ESA011756583.