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 0xf9c1f14aa99703316a004df3ae66d17713946a94cba5f45c7483c20d7a460c69. 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/cf33d042-4f48-4e45-88ad-ae912a37c767.json and https://artists.proofprofile.net/proofs/artist/cf33d042-4f48-4e45-88ad-ae912a37c767.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 0x282ad9381f08558b7f6ec85342e46ba2c7cab1de95612d8294cb93273262734d. 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/MAA172001346.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x627da5b5e0af7ea48857ed7d554f3b4bc11f484878dd859bf29c8d33e2c9f612. Chain 2 (Bitcoin): anchored in block 958805 (2026-07-20T02:22:58Z), 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/MAA172001347.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca72c91c29151c19adfd27ffcebe2d732b6326b12a04ab6a575375f7c1a06ecd. 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/FR10S1668330.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23b3c6be9aa14cf494b4f6b9032aa941a6d2b53326af0aafbb06a345f10b00f2. 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/FR10S1670590.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97a839a187352386916a7f7774138aff9848601844ddf9a3de08f5bd85b14f39. 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/FR10S1670595.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed5d0996bc0d21d8e3b187315dd09fc3407cc9dcdca070ecea6b642c728860f3. 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/FR10S1670599.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3152e3cbcfc9037a3407c6639f715d3b94bf61fb38953467eb949ec19b1d668c. 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/FR10S1670600.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x775e011a1382178a8a4114e9df5dee45f3305e6ae7b941a6f11cd5a3beeae319. 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/FR10S1670604.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84ad0254e4894141d65282040c54ce9a59d72b39f2249181e7112eed97c5a96e. Chain 2 (Bitcoin): anchored in block 959054 (2026-07-21T20:19:31Z), 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/FR10S1670605.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5baa4695b74bcb2d346e24c801a97155628ac2d8f7c42bf6e1e297ba4335672e. 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/FR2X41673389.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35607926a8c14dafbd1965cbbdae90a674b1689da3b571b5946af3fadb9b3b49. Chain 2 (Bitcoin): anchored in block 956396 (2026-07-02T21:01:51Z), 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/FR2X41673392.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1362adc95c4a718047c48b10e9647aa0bbf02732ed24dedbe86344f88ceabb96. 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/FR96X1706820.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x296f23b6eea7cf6cd2cd4a3f0e34f15b0a6607fb0036890915f4202959b910f1. 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/FRX762123236.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc751204f99aeab76e0d980d4424bccac301361cb854982f96434b74c1d9ed726. 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/MAA172300283.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7dc55d60c4d1a1a56fd554632d6f53a5fe9336d5acc2eac949ae4428ce518f5c. Chain 2 (Bitcoin): anchored in block 956396 (2026-07-02T21:01:51Z), 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/MAA172400169.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xecd0a75562cf60c27270d28f44a2d0e27c317aa07fe70751ea936300ebf6db1d. Chain 2 (Bitcoin): anchored in block 958805 (2026-07-20T02:22:58Z), 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/TCAJS2565596.