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 0x4138fad1743adde75f3683debb142885bab08080e8ed953815bc3944123a2956. 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/49661e49-3fdb-4d1c-af4f-edb7c31325c1.json and https://artists.proofprofile.net/proofs/artist/49661e49-3fdb-4d1c-af4f-edb7c31325c1.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 0x86807d920919b7b1837c0eb977f5f5fa367556283f6149227698a7dec808d5d6. Chain 2 (Bitcoin): anchored in block 958251 (2026-07-16T06:29:25Z), 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/USJ3V1119229.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1c1a2895be984e2a7ff56713628466330f019fad29a1989d4fa70d9c8913797. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/USJ3V1119234.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79ddcece240a6a6066ee9758a8923eb2110a8312044201f646aaeb5dabd01dd4. Chain 2 (Bitcoin): anchored in block 958703 (2026-07-19T08:36:12Z), 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/USJ3V1037295.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb24cc5be224396879380f24226450a4a8a2cfa15cc51ad9c9006af475451d8d5. Chain 2 (Bitcoin): anchored in block 959024 (2026-07-21T15:31:18Z), 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/USJ3V0645178.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0065853ed506f515cc0a3ceb97244c69905bceef2edd9cc75c080c06e01e37e4. Chain 2 (Bitcoin): anchored in block 958211 (2026-07-15T23:24:33Z), 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/USJ3V0645187.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x693a94e3133c5310392e9912384398891bb6520cb4d43ec4685141f3533f93c0. Chain 2 (Bitcoin): anchored in block 958251 (2026-07-16T06:29:25Z), 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/USJ3V1035748.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8fea9ea4aa5c17ea2767f9b27629dfdf76dd93f7b59a205c5979be47e5605bf6. Chain 2 (Bitcoin): anchored in block 958245 (2026-07-16T05:50:22Z), 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/USJ3V1035755.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b830931abd6b16c61b89398e76b040c705bf2425c12d9d23b83af64fdf4ac5d. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/USJ3V1083226.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac284200ac950614bc80328b35c9962003e17e13d5033867e39f81b1bfe3b13a. Chain 2 (Bitcoin): anchored in block 958695 (2026-07-19T07:37:00Z), 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/USJ3V1060701.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91454c5b2a9ab3722f5edc811849bb4041c56c6dbaa9fa9c2e2861ed5e9b46a6. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/USJ3V1060704.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd54fc33b996128b829963eafb635fbe987564b8545867bf5c89ac0f84d93b51c. Chain 2 (Bitcoin): anchored in block 958770 (2026-07-19T19:26:13Z), 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/USJ3V1060722.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e6ee794b1957fb27a2a40549ee5d3fc86515445ab6259a6686899384a452c7f. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/USJ3V1212882.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88cab88e0c2d5e147be757e23b90b247c036e2e55bbda1f7f98b99876e96f0ed. 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/USJ3V1212892.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a31ac2a2a0564864ee8bf16b012e9ba8d80b56f2626f39ebb940bba558b19e6. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/USJ3V1255977.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xabe877dc07ceca21d97d5a08062006a50f4c7289892f0c9833a9e6d464d3f185. Chain 2 (Bitcoin): anchored in block 958060 (2026-07-14T20:39:42Z), 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/USJ3V1255978.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15595b629935b6376f863506d97a4525a5e5e6b2f734e56fb96a91fa4972d508. 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/USJ3V1255981.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x903898e45b839f8c50eed8d2beff662b06060f9077f4270cc34e48c05a040984. Chain 2 (Bitcoin): anchored in block 958975 (2026-07-21T06:12:52Z), 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/USJ3V1255990.