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 0xf43734b8e217834a93bf3dd5a7c7e2423041d35990177722800369b4d18bed29. 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/11c8a3b0-a14e-4636-b43b-d66c428b9541.json and https://artists.proofprofile.net/proofs/artist/11c8a3b0-a14e-4636-b43b-d66c428b9541.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 0xef992d3c733d61b890d5e3724b5579db32299f8b585595446976e45a0284628c. 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/TCACI1551252.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe9dafdb91f72f1076bdf2418d41b7c07f7f6ded7670321b6ab19ee37e97c2fe. 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/TCACI1578728.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e7a0bbfc7e73b5dd0fd62c2195ed96943efc61bc2ea5545ee0267dc772e855b. Chain 2 (Bitcoin): anchored in block 958432 (2026-07-17T15:43:17Z), 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/TCACJ1569523.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25fb22250e6b62df486cea7e0f509995e6da0a3c04f09916501350dfeb26316c. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/TCACJ1597342.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1caed6c063d210272b0a118e9d480671996aeb16f8b04986568a3b28627f86d. Chain 2 (Bitcoin): anchored in block 958882 (2026-07-20T12:45:27Z), 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/TCACK1533178.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e35fc2b0b53bbaaca88125fd680fb2537a8dd1dc64c5cdf550d8fedf91270ae. Chain 2 (Bitcoin): anchored in block 958901 (2026-07-20T15:07:00Z), 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/SEJMR1635010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00cab8a719d62b0d42fb56ef3b242504b898873e752d6eac056b2368691cfc1b. 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/SEJMR1640010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42106c0dec6e43281590b1337c8123f04914360833901c9d47c16ca76381c7ee. Chain 2 (Bitcoin): anchored in block 958897 (2026-07-20T14:57:46Z), 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/TCACO1600401.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3c097ebc5b371b15eb4206cbcae93c0c65d2c30c906d6c77d16852afe83392d. 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/TCACP1608272.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7d1f26e02ac4fda4ac3a12275a0fcbb686d80aeab999b0e58356c78fb44eea2. 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/TCACQ1634057.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xddebf4688a2a2b9158ea3a5a2d9f5593716df75884318e7f24faa48aaa685182. Chain 2 (Bitcoin): anchored in block 958607 (2026-07-18T21:01:11Z), 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/SEJMR1800010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4ef98331ddd3cca15101d84d68ef15c303de818c40906e196ec225f4eaeee53. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/TCACS1663939.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0590e29f9eb9168b46483b96aa2be4cbad4df4554a3d27c80789e34f28ffb487. 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/TCACY1756882.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7fad61a9263395178b7317d49447669f30e55d8f039a6c269eea8751426cbc41. Chain 2 (Bitcoin): anchored in block 958520 (2026-07-18T08:19:09Z), 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/TCADA1736217.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f6f3a6459b9726284eac082c71641b0d410ebc74c6cf0f8958fba3ee76fcb94. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QM4TX2058653.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88208238740d82ad2e09c8356905ab870bd899225838c7b01cd5b5f4b5686a33. Chain 2 (Bitcoin): anchored in block 958140 (2026-07-15T10:05:23Z), 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/TCAFR2196758.