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 0x09e02d570e08cdbef2908b025becc304f7f64a1de81cb0683810a55075fd85e1. 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/20784b37-1dcb-43c8-84f6-9a7992b317b4.json and https://artists.proofprofile.net/proofs/artist/20784b37-1dcb-43c8-84f6-9a7992b317b4.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 0x6578f8928346a29e4ded977e2af973691b38c5492f76b5f93778c30ae9ff6477. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QZES72408365.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9fc6f39e047d414ef3346443a630bbe62badf7fb5e254fc1e8619c17a8e817f6. Chain 2 (Bitcoin): anchored in block 958086 (2026-07-15T02:55:47Z), 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/QZES72408367.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8df57195d684aeaffe697ac3ac342270aa204cfb95013b0af9fff126406e016. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/QZES72408368.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc61870cca964e4c30ab1bf437c90511f26b6c94a4c4910bb28b97482a199ce23. Chain 2 (Bitcoin): anchored in block 958955 (2026-07-21T03:03:40Z), 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/QZTB72417584.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60fe2dabb9b5bf3693d7bb6db06a93e19c6da071f04d5e7dfb377cea35e740e5. Chain 2 (Bitcoin): anchored in block 958152 (2026-07-15T12:00:27Z), 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/QZTB72417587.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5a48712299ece15a70156060de36b3961014616997a5f25f703e14cd7c1826c. Chain 2 (Bitcoin): anchored in block 957770 (2026-07-12T23:17:00Z), 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/QZFYY2599922.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc6fec6647f1d3b0a3fe2f50ecb482e650b45fd1d5badb8e9c78e44e228ecfb73. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QZTB42393512.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa051a6ca8425e610066498a50531c2e3167fb9f2e1e8cdd50b10e7963c64d008. 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/QZES92574893.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc0f6538ebe84de3a3dde4bdbfe53044ca283c59ea6f90eb08d6bfc738f7ef85. Chain 2 (Bitcoin): anchored in block 958086 (2026-07-15T02:55:47Z), 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/QZK6P2530110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17633de94df145ceff16637b3f3fc69e5df581a93cb1b93756237bb170fa2d77. Chain 2 (Bitcoin): anchored in block 958242 (2026-07-16T05:02:52Z), 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/QZTAX2554883.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7eeb909d92980d48cd2d513ba3e38c1fcef5a0c059f2005ff41aef6aa1002a8b. Chain 2 (Bitcoin): anchored in block 958594 (2026-07-18T18:05:01Z), 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/QZTAX2554884.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa021144a2d320dd04a82d785e09e60b3fceba1fb8b1984c318c5df52b221a97e. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QZTAX2554885.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea22490d68a102e05eca37caf154ae21a6a9ed45506fa1945498eb51c1a946a5. Chain 2 (Bitcoin): anchored in block 958822 (2026-07-20T04:30:07Z), 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/QZTB42393514.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4fa69e9a47dea51da8dfeaad360ac152922259dae1abad7e56fb6b8a863deb2. Chain 2 (Bitcoin): anchored in block 959089 (2026-07-22T02:17:57Z), 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/QZWFW2573500.