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 0xa9f433cce8c22ca2ef4cbde2075a293584d20b77043fd6ba7bd330150cae8971. Chain 2 (Bitcoin): anchored in block 953408 (2026-06-12T19:28:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/37cffd2e-8be7-40f1-bb95-ef6b857d9f22.json and https://artists.proofprofile.net/proofs/artist/37cffd2e-8be7-40f1-bb95-ef6b857d9f22.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 0xafb4b1463be7314a2ecd3e16ab392af56fd7b43600e57f8485912a0ac35de91f. 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/USAT22312327.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e5a33ca23cea6733762f31bd440c1f06c0a92cf630996c786eef0ccef7fe55a. 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/USAT22309818.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56470427a27fd5584210e1dc7ec3bb4cb3a9eabe4822feaa09cd7d4fbadf2646. 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/USAT22306194.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x938af45dca1123118102b13ddc388e306f76911af8bcbf5f59cfc6b6114aeb1e. 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/USAT22219579.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe65d6a47a8f9f46eb07d3565b67b9bcb45cb2b57eb74aa68690352078016c6a5. 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/USAT22210374.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6430185d471fdf52711f90a6d6abe067c6d08c8f508808feb702b40525355ee1. 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/USWB12201195.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x515bdbbdf62d0f73f4c405724aa534a00301fbd4f9fbedea829fe4671b3e58af. 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/QMCE32200229.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa80aa07159dcbcc8d168c74bc19de7b5be804c126739569910ec8e730970810f. 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/QZDA52203322.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf47b8f619d526ea82030d0c409dd247310d1094a8e0f2feb1e10bb0100421c2. 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/QZFZ42221106.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfdaeb459430dfbf83d292a59e335a4e70a990ad6ce30ccc4c1e1d853b8d01cdc. 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/USWB12105818.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x966e1bd695ee1fea0f6367e02c1884180b1db4ef22f109fc04174a5e6fbef3dd. 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/QZNWU2143327.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0d7467fdd121713f01f6985f68cedc261005def7c43c028d5d4e7578146579e. 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/QZMEN2143533.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x007ecdb09ceb20d75308af9c3b48a8f31a06461f6a2dbbe1635743e51c495e89. 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/USAT22305971.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9196cafff23447ee4239a1b18551fa016465a5cfd371fe771358b3804c07d54. 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/QZK6M2175613.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7855af87870cb6f173b2a9d11ceb094dbdd0c12c8e011ed6791e548b03da84e3. 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/QZK6P2170405.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c3c3311ea95f627d42a00f5892a7d3bd0e4dce0abd19d383bc768509ac93f91. 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/QZHNB2131336.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x818d9188552b8e5bb5a59b4a26a5c8286d94132d9b1bfd2adc8193a01fec2d31. 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/QZHN92108049.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf921244a5f05cee455831054e105326b3b36a26e2d130cdbabdbe2968ae82453. 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/QZHN72117465.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20e30b2103f8961bdb0eb222a46335e5d1e7ea214a3d5069e60ed76e5bebd727. 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/USAT22304823.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa488f3b99b40c27d5272db701ad2404fbdaa7ba15b4c3f5b81b737291de9591d. 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/QZDA72180643.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6fcf0a3ebf591de00cae1ded16753e707e785bc22d01d57f29869307b003a230. 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/QZDA52115943.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad3647b9035b615af256285c17766d7e334bce901dcf7c5063446ffeefec5131. 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/QZFZ62149269.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5e61981368da3c4cd78b8da46d3e1a702b7dad4d996542ecd6b64044279080e. 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/QZFZ32133578.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4650ca94e6e2ceefe6f1b0934f0d3e40efaead7e8f1d27c6e41cf7c07059510d. 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/QZFZ22181940.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c3a9ed21c7ba7a3d7c1cd0a464164dca6f6dc6241212a192c31658e21269f06. 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/QZFYY2126157.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc295b84aceb0c3926a10d7ae68dce2fc641785e3ed0ca955ae406ed6fe9ed8c2. 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/QZNJW2146801.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0552bb5b70375e2232e3b19ceb6fe82d13b6162c05c53a012a800386c1a4a3e9. 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/QZHN32189754.