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 0xf639085164ba1085ef3f386a9658211cd982f7285a7fce0d5603df225dc5cdac. Chain 2 (Bitcoin): anchored in block 953972 (2026-06-16T16:31:10Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/29bb4b7c-7c9b-47ce-9986-59eb805640b0.json and https://artists.proofprofile.net/proofs/artist/29bb4b7c-7c9b-47ce-9986-59eb805640b0.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 0x7e908b0c45d91860fa85ef8eba4c0fa4f38ad05d283b04124ed280276fe81a7c. 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/USCGJ2000312.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62345590fca81f0f1775103551b05a910e560f4ca9571bb48b3dac10da219194. 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/USCGJ2000313.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9b6959681673dd81f537f884674691b4e0f83bcde3c57c590374f381e1b1553. 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/USCGJ2000314.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5f1d3a7c92ea574bcc524b7397680671948c38fdd39c875bd41cef65005cdbf. Chain 2 (Bitcoin): anchored in block 960288 (2026-07-30T17:41:38Z), 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/USCGJ2000315.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd81d374070a0da4bfc8cf778c0b7e7038027d6628cf1cd8658c8a9e14d156006. 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/USCGJ2000316.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd3561f1b8a8af764aa83febff2d1e6327f72ab0d781c0df98f5d0d57f569497. Chain 2 (Bitcoin): anchored in block 960247 (2026-07-30T10:42:33Z), 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/USCGJ2000317.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8074dd2edcee00b43d265d0ca41342c2246a5263b2c4dcf96006172fb565bd91. 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/USCGJ2000318.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x743e81fa94f8bbfcdacdb764ec286b168b8535aa4ce0e45553161c8bf0804dce. Chain 2 (Bitcoin): anchored in block 960099 (2026-07-29T11:30:20Z), 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/USCGJ2000319.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe64f76fa8e93082fef3cf0eb311b4d7c03434b70e4fc5434d1f8028d999e084c. Chain 2 (Bitcoin): anchored in block 957052 (2026-07-07T14:50:41Z), 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/USCGJ2000320.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x943c00c8b149f7a4be56f2807ad29ea0a3a243e79d88ea227de812f01b692cd5. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/USCGJ2000321.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x80aa16eb9f9f2a9efeea86ec7f1c12df22f729ccd45a579043c269667dbf09e2. 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/USCGJ2000322.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc110e64336b2476954c88dc1e76b0487dbdb337a921bdf6820a23edf94e1a4db. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/USCGJ2000323.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46f2a47f29fe1be09afb00822c9c35e929ffd7227823f71e2288f15e0a2e2aa3. 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/USCGJ2000324.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x614d5b3529d32d4fe53073e30b3ed736021e615441fd5c874b50efdc231c3fae. 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/USCGJ2000325.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb5eccac675f557bf5a1d0db387a476a2e809a37b8610afeebeac2f02941aa7d. 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/USCGJ2000326.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x897b634d4bc168469cd01e1766596979d122679ec03aca4ecbdef6d7e2962632. 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/USCGJ2000327.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x559cee1a8cc1f690ad674a5d08feb5596d9d4f77cda5bea11982bce5e4c8f742. 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/USCGJ2000328.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2e99d72a1f27815ab5cff671476129032045fd4f1bf7f0b67802fe6cf73abaa. Chain 2 (Bitcoin): anchored in block 960187 (2026-07-30T01:34:28Z), 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/USCGJ2000329.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x658684e38cc2ccd047dff51f3ecb019484b2fc9e9b2aaa12a68c83df76b33e4b. Chain 2 (Bitcoin): anchored in block 960268 (2026-07-30T14:53:07Z), 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/USCGJ2000330.