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 0x35e78723a76d1b18a5352535685d16874639d732b01dbf123c693459e62fdb6e. 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/3c8441e2-0473-4dde-bf2e-b2a73eb0fc73.json and https://artists.proofprofile.net/proofs/artist/3c8441e2-0473-4dde-bf2e-b2a73eb0fc73.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 0x6983dd1aef5bb07ef695ac6a8a260f9b88062addeb439d4f4ad603b260155f55. 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/NLT2H2300501.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x698b3c533bb880bce0d5b75e05ee018986626fa2ce5e326405b224a74dd924ee. 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/NLT2H2201027.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c4f373defd2c29c19a131e5e18c2bcc408ad73778c02b012966b4e0ba8d7341. 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/NLT2H2200950.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95c226126cad430bdcb0080cc13f8bdb7ebd4c16e33ded26654ca90ed6965c31. 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/NLT2H2300031.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b2792fdf256a0173be48f7f8559e62f0a6cd17abea1bb6f6357231a3bc114e7. 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/NLT2H2200951.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeba7d931957cb8c94183d65ffcf41000f9006ff1a5261130533575195aad458f. 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/NLT2H2200846.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc84f8a6ce65303ecb5eddf6424450b9eecfcdffd3021cb903bb2dbe7ad1f3360. 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/DK4YA2280001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2e6b7127c8f7d898189f1f4980af78c8c546b1fa47a0602c42864898ad8ae80. 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/NLT2H2200214.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7fa46aad106a760eff8c942f59dc864007f27999f2d2c666f16fe9c3c9c9390. 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/DK4YA2277601.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe068fe81fc3e2948fc3abb309d2b51a77bade96cfe3dae66d099bc82bd1a5c55. 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/NLT2H2200053.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae0a92b37cbdc67c2d910511af75c879ce4a45d730ae4bd44d15265a23ba2e19. 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/NLT2H2100750.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ff93588bdedaf05290c42bd0b6b7a8ca5f038ad0532d9e797035375b9b46bab. 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/NLT2H2300733.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3079f9e6cb77a1d9b33d3309ee26d0cf97ad89cda2f51263273ed36a376304e9. 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/NLT2H2400070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e23bff6ad430c1964a5336f61d4bf23813e148d5978912732cc09e8df5c4108. 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/NLT2H2301048.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4fdc744f68b23b79c166a6b62cc42af260ead14ae5c89736e9850cba73575b5. 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/NLT2H2200650.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbde4af67a7eaaef5fc998587cef509370f4229104cc40716bf1cb55225716b7a. 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/NLT2H2401086.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6096ede89c18377bfece95de77bf71fe912c73fdd3772b75b1f59e1192190e86. 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/BE8LH2400284.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73c9464dbf229880eb55aa90b51a1e98a33816c43a66eb3a4eb0923b567c0340. 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/BE8LH2400271.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63a073ee6d490ada5b565593f4e6c1e3c6c0054fe1f6f528be928b6fb0571c28. 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/NLT2H2400768.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a983c13b58c58e0b36274307e47edbb4e7a88075c950975777d026508f7ef15. 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/BE8LH2400158.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed2dcfede00e54d89c44a822a14737412cc1bcc8f8d2ae38d6523684f488f38a. 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/NLT2H2400439.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7bf9ee713c80fcbc7514e1ba44daf86999d1d7bd85eb2260ad74b64d89724db. 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/BE8LH2300419.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9964c0bde216a342e04dc6b2c1f851c0e564fa76a2d55f1423a302b9b225c791. 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/QMFMF2364890.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0bdf3d4ed0e04f3f6c8de302e22b00a823e91da78d51a3255ce4453612e2d52. 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/QMFME2353739.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5875a92010106e47b026be527131d22492cb676e99c9ee24cbc298ab864832b7. 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/NLT2H2300443.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52efe65e64a479ec2b26c21b6fb5211cc324f0504a9ee7f7a4638ad861b4fc84. Chain 2 (Bitcoin): anchored in block 960247 (2026-07-30T10:42:33Z), 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/FRX202338053.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x549ed045807442be20295e3a2fcb5bb52027e28747382cfb4655d9d628c92c59. Chain 2 (Bitcoin): anchored in block 960337 (2026-07-31T02:51:48Z), 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/NLT2H2200520.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb854b2eabfe97b305341a6cedb574e179621e08523851e8594cd147fba0ae596. 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/QM4TW2485958.