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 0x2d081f6005e1410d36af62e190fd6d21cb98be66486bf9db7f4ab19b393e3a6d. 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/5b6d8b51-0664-491e-a76d-436104b0355f.json and https://artists.proofprofile.net/proofs/artist/5b6d8b51-0664-491e-a76d-436104b0355f.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 0x5be338b7dc3e889f5e6ad0e40a541f68b02a0d6e8fdbcd0d6e84cc11ff1bb4d5. 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/US3DF2028840.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2a5328b9a3c10d85de6560646c5a0c7294e75a261072efffb0d4714abdf60f3. Chain 2 (Bitcoin): anchored in block 958733 (2026-07-19T12:51:21Z), 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/USANG2183595.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9c13f74575096160d349dbf37a6bfff7c27dee07b74be379b1e6dda75e2aa87. 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/US3DF2249879.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23c65d0a4ca372ead12b39c47241a8205ca07a519b038d1d74e6a49e71a0d617. 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/BCHRT2400025.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c568706773cd74d7cc4ed7d94e226e2721f0f833e2ec2bc743b088fe60334e1. Chain 2 (Bitcoin): anchored in block 956745 (2026-07-05T05:33:35Z), 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/BCHRT2400027.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb24f15f160bd62202d923ea848749eb5352cf65c2b2f55fd9a5af51b53a3460f. Chain 2 (Bitcoin): anchored in block 956745 (2026-07-05T05:33:35Z), 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/BCHRT2400026.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62ec8f107c5a9633bcae226f3726d01942feb0cfdc3bca2e7b141aabb3838e0b. 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/QZNJZ2204959.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2038934c842956e6062189ac540b2185f87ecfe028188831f153fc7075b2d9c. 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/QZW9L2206156.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x331fe9f11397d07ea4a2bb1c340f196c36d304ec4e8886fc582fa6be5e1a1ab3. 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/QZW9L2206157.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87977e1064c01180135700cbddf48ffaf4e2ffa3b3e2ef703b511881c7bbc9b2. Chain 2 (Bitcoin): anchored in block 960459 (2026-07-31T20:22:46Z), 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/QZHZ32240257.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7ac2333e531483bf6e8e8b4a9f5bca4a61f2e7a84bbc89bafcb276bf79cb222. Chain 2 (Bitcoin): anchored in block 960160 (2026-07-29T22:48:59Z), 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/USANG2242291.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78073cf55e2805bacb6d64b99e9742c4a61f0d2db69a30de90e5c66d77363edb. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/BCZ2A2400007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59f5762ebdababed890628d52d8f805c9af16b14b299e77dfbe3253c823f054c. 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/QZNJV2334900.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47136e01fcd0494813e955426405f3491726369ae0a953661185a69ebb5cac5a. 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/QZNJV2334901.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7703567b6ff38c51dafa85893d42aba8ae1747ada211e271e4c86d3118e35bfd. Chain 2 (Bitcoin): anchored in block 960240 (2026-07-30T09:57:33Z), 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/QZNJV2334902.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa06e8b60ea2f582c686bfed701e50de665b93b99196444fd86c6e3c9f8492ca. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/QZNJV2334903.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd22e04ecfaabba6d5af6518a8ecd77bc2d4efa61039b3aad217844869bd0067. Chain 2 (Bitcoin): anchored in block 957061 (2026-07-07T16:07:00Z), 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/QZNJV2334904.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x82a36da508cde765e1365706217ea65c5e8e830e2d335b36e0f185055469e8c5. 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/QZNJV2334905.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x561ec183253ea301c957f8e9b3d70f1ebde793a63699d2beb5c480e07df78773. 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/QZNJV2334906.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e33381faa1092527d917d5cc9d963d01246b734024f728d837d0753e173482e. 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/QZNJV2334907.