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 0xcf572bdb06a2c7dc03274812449a173d4fc6a2426a18c24e53caf80e8e2103b8. Chain 2 (Bitcoin): anchored in block 953778 (2026-06-15T11:57:35Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/ba0e37e0-f61a-4416-9b21-c80beecf6990.json and https://artists.proofprofile.net/proofs/artist/ba0e37e0-f61a-4416-9b21-c80beecf6990.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 0x3c8c9a633a5b8ae23ee97313029d73ae7afd8433ac882058eb7c2acf74ac6dee. 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/USGCV1282016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd67e48499a8ebcf839d99c3035f7dc7146ac24c140c5501934a0cd6e15fe776b. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/USGCV1282017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x988850cc21cabdcbccfabc4f367dbaa6ca621b5e0fd9987b43cb0532c4604415. 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/USGCV1282018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa33ada740e8b3177ed4c98d489e3ad8e49c86777670b2c0fad603076e6dbf139. 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/USGCV1282019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1540d6e43e277bf352614b0a6ebe774ff54813dcdb42dd0a367e8cd9ad27641. 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/USGCV1282020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb1024119ee022e41ced5778dd6dd9d957f96e45f82c1770f93bf41636e3849c. 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/USGCV1282021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdcbf3f132dd3c8f3ec11d0f266910ee8fa581d8c07f675c6dba2de56db6bade9. 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/USGCV1282022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x410505a7dc31f4b5d6532508820529f79a34fcae6a9a0857e15bb12611247a4d. Chain 2 (Bitcoin): anchored in block 960229 (2026-07-30T08:30:10Z), 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/USGCV1282023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa7b1ad3420e4e119d8bdfcca9a21ee57e4ecac25568bc090fc4093475046599. 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/USGCV1282024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x830c85e8a0ef36aa06fba93bb97713d24d2bb923b918340a8c035bc0c3f6fb9b. 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/USGCV1282013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32601f3f38a8181fa368413842b360ae436a8be97d08881332e2414bb5db0ea0. 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/USGCV1282025.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6854d867d1c7459e79b709c1f327c8967fa369385ab63f72681dd83bc285d334. Chain 2 (Bitcoin): anchored in block 960223 (2026-07-30T07:51:46Z), 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/TCACZ1728751.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9c9bf48e0b25d7cec449d9872281004f65910844fa994d5ebc8966bb9b0765c. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/TCACE1596375.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57a26634cb23ceade08eac8f7b8dcfae73527a6659450acd4641a4ed0f72fa06. Chain 2 (Bitcoin): anchored in block 960509 (2026-08-01T04:30:37Z), 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/TCACE1596376.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb76c6a5e31522fc50e79230c13f2e2b1050d34e4a4f46fcfbfca266215354fd6. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/TCACE1596379.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f111d2cd1eec35bcf02145163cf1dd0cbe0017f1513d76300e0c7dd9ba82bee. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/TCACE1596387.