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 0x0422b7b0b1775706bc57e730991ca0fdd9eda73c270b98044d4bdf188d4e1baa. 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/c5e7215e-eefd-4b24-aa63-98d6b8ed09d6.json and https://artists.proofprofile.net/proofs/artist/c5e7215e-eefd-4b24-aa63-98d6b8ed09d6.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 0x707de7ea4fbb6615bd91a56e1e387efd0dc231c1f19b6595d0961f92930a8df0. 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/FR9W12358720.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89dcfd6d30a16359421020c3dda01bb6a1430eeab682c8a75e5fd38b4459708e. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/GB45A2102612.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7fd163155e74be82dae51c4bec2b7dccd0e00ff365b6f78edbe7d205e9ced5b. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/GB45A2102611.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89dcfd6d30a16359421020c3dda01bb6a1430eeab682c8a75e5fd38b4459708e. 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/GB45A2102612.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x159479c7835183e264780283c5f3c08b9fac7bfeb1542bd80b66a9e8ec67e47f. 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/GB45A2102613.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e13ea7eac92f05d18e76018e7b13858e8aa05ffceb7f98f82d941eaf614071a. 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/GB45A2102614.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeecb3ec959eafafd6c33a729e27df7ff19f25c316171dc9e537757b9c7388bba. 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/GB45A2102615.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62f1dd9dc9b962c0137ca508fe9f01cf48bd99f53aff438cb1c0fdc4cfa7c2a7. 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/GB45A2102616.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f57331fabab9ee9dd2fa47d0d5b5a8c676b9bee6b49857604ede0588fc9605f. 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/GB45A2102618.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbbf2680e61b31e6296f2d1fe66f089966669ae9c3062ec836c98612bf4a2a933. 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/GB45A2102617.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe296bf0ccdcb3e341cb7c7948aaa0032cdd80c4e36d3abac818b9969efdb229f. 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/GB45A2102619.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab8b0f774ab0f49aaaad7f5d9e3429f8545ff5d4332a102ad00df3ffb444be62. 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/GB45A2102620.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a72639fe2db9929760de9c07cdebd0f43c52f4be7e18f6aabfebd68a8839a3f. 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/GB45A2102621.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7894bad9cd6717d709140c7d379a8527b8f944b677aca0be2ad4b575d05f330a. 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/GB45A2102622.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3d7a95a6e74a025f589c6b97d16e0709865bc378906b975050bedd77bc3b3e8. 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/FR2X42106954.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa614b7fa2509abed20251b9af5735da156a5b1095f6920ee61c3e7199cd68cb. 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/GB45A2202904.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc698d2729e7584f4260cbf73b689e37ac348cd0376babc5a61b30df9f46a9143. 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/DGA062213556.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x707de7ea4fbb6615bd91a56e1e387efd0dc231c1f19b6595d0961f92930a8df0. 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/FR9W12358720.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81b78c7a465a4384fad588e6dde5349eafa9c2b77e4eb93479f180032f706fea. 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/GBUM72310512.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24f28266f5241747c10843901075f9b374c3cf819de9d738aa46801f5ae69647. 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/US39N2305162.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe08a7ec48a3533fa271e2b486a732e9aa9217ac7b1566ed5fbb85b8d42ef668f. 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/GBUM71903565.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec318fe7f5c819189e91c889c95ec83a6b4aa2d978d6d2346a438e1cd37a2deb. 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/UKXN22276251.