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 0xd3148c92c23bdfb88b53ea0a732ac3d9bc212eb7ce3756d52ee37622a89044fc. 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/5d8365d2-c7b9-44f4-81da-2dce35872316.json and https://artists.proofprofile.net/proofs/artist/5d8365d2-c7b9-44f4-81da-2dce35872316.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 0x29dbe2c0da8809e70752d668c9036a777f0f3dbf1bc6a2166aecc5a7b786f96f. Chain 2 (Bitcoin): anchored in block 958905 (2026-07-20T16:14:34Z), 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/USLZJ1707732.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbeb18aefccac3c1b4d44e98f0e5dadfa87ac6986297312f826422dffbf6a6b9a. 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/QZ5FN2072573.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda9c2f2cf439cae06fc9c02172d2f9525451db8b57f6c838848ca1bf376b3d67. 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/CA5KR0015157.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa65d912c79c4f9580523f2bbc98e19fc8a88dc4278e1551ce620df593c4ccbea. 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/QZWV32458539.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e8473bad66823a93118ac91c4100aeb1907a60db7cb27a0e4d22218c41dda9d. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/QZZ8A2464068.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x278cae0f5eb97c43e4953ca67df530bf38bde904459306a2e3dcfe8783a2bfc5. 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/USLZJ2583434.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdea550b601b445c7f0fb87cf43dbf9ed83984688aa95bcbc46588f8fb7509abb. 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/USLZJ2583440.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6034815fa66a38a28b3ce2caf58a771f1f958517b1a1e64542d48b3cf7e665e9. Chain 2 (Bitcoin): anchored in block 958110 (2026-07-15T06:57:12Z), 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/USLZJ2583442.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ca91cec11dde44c19dfa71b5dc92637fa24c7fa0ccd7044060c4c6fdf52de83. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/DEH741703127.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5b9a72305ddd646ee6d0472f1778fe18164fc91dda1f9940a798794a0c64394. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), 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/DEH741703125.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2548ebcf92f57dc6daf0e4cd811ca0fd81f513c0234a7a704de7725469ec6bb. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/QZWV32581130.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b8805c513677447e9bfbc9a500996164392d2389b720351f0e5fcd8f3bb8fb8. Chain 2 (Bitcoin): anchored in block 959134 (2026-07-22T13:34:27Z), 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/QZWV32579317.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4633ce6b1494a1ec82d2444aa304b259418f72dd1864e1f5e5ae6ae4c95398f0. Chain 2 (Bitcoin): anchored in block 960145 (2026-07-29T21:13:37Z), 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/DEH742224294.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67f53e214e1b94c36b70052990e148f00f5e5f36f13d1339f5a687e915b6b6ab. 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/US83Z2308819.