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 0x2db3198265f7733f7f36d0ff5a8369b10ce603fa58089ec6025aed5ba8106414. 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/aa48acba-44ba-4935-8dd2-65606926901d.json and https://artists.proofprofile.net/proofs/artist/aa48acba-44ba-4935-8dd2-65606926901d.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 0x279644d456f982b0fa08cc1f3e1910e4eb6bfe1fea8131e722ebed7f4b09741c. 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/QZRP42100141.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2888664137cae6342bb5f9e9f00a162f8138f61b13e97c490037c469729b4140. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QZRP42100143.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2077e1aebf565f224d6545d6438a936e8426f1305b7d7e9085a6888ee519dd1. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/QZRP42100144.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d510f4a3e4aa6d702f75623dabea42fb89334224e1ceeae22368d5edc453087. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T13:14:32Z), 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/TCAGP2246166.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ea6c1b1f8b51004c7ce11b88ddb4eac333663f0eb7a9ea36eec2f86b81723db. 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/TCAGP2246168.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76ff67a7cce54315129aeb9d81cddbda5ceeadbcae6d3847df2e9574c5dddb71. 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/TCAGP2246171.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d08b0d8012a74c017b818f3a2b747e57fc435c6434feab3c25dd14f4767d328. Chain 2 (Bitcoin): anchored in block 957638 (2026-07-12T01:56:41Z), 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/TCAGP2246174.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11c00054847071eed5166ebaab1adfacbe093d8a441216ecdcd105008a5e4284. Chain 2 (Bitcoin): anchored in block 958891 (2026-07-20T13:27:11Z), 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/TCAGP2246176.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc18237798ffb47d8d2a1a0ec03f8e73d36e1dea273756ff48ab7bc4f7b98203f. Chain 2 (Bitcoin): anchored in block 959137 (2026-07-22T14:03:35Z), 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/TCAGP2246178.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4396032238daa135b31fa04b5a9116e3a273d167e25edf19e53fae57ec7a849c. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/TCAGP2246180.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a90fab5cf987c1504e26b814b7f34741d2a366ef9c362642b8919273fa8e084. Chain 2 (Bitcoin): anchored in block 958765 (2026-07-19T18:01:47Z), 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/TCAGP2246182.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x14024cebca5d172bd146135d47d59e9ef87ef5d57bb7fbe73c7b6c03be44219b. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/TCAGP2246185.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5af195ded5d897c74b172471070f3582cd36fb513ae108e2398acf487625ce65. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/QZDA72455710.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5569ccb2a58bbc18bc44f06fa8fd6ca95017a289b09cf3f7e2bd3ba1c80309c4. 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/QZMEP2404987.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbac743cd12f4fda98a6289c403e0d6a90e10835747d0b744bbe6220471bfbacd. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/QT3F32414223.