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 0xdc53975ba53ac31ad47ebc8b118e45d460362167ccfe585733e4119cf095bc7e. 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/87fbb0e5-1e38-448b-b887-18de05c7e88c.json and https://artists.proofprofile.net/proofs/artist/87fbb0e5-1e38-448b-b887-18de05c7e88c.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 0x722cbd7edd2bb00a558dd9ba28e949e518bc5fa9c15b372aa2e231ce1afd2dfe. 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/TCACL1694030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf792bef4f6122bc8c9681d393307cb49ca5db4e05bd443e256414c3289a74c28. Chain 2 (Bitcoin): anchored in block 958218 (2026-07-16T00:33:33Z), 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/AUYT31600006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11c09315e8d08c8dbe5add2110d799eec972f44bf243ac476f668dc518a6cec2. 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/AUUM71900065.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea3be3739d1084fa4bae3d70f34ef2cf75ef99ec4ac9f2ea8b91d0d3f0a50bea. 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/GBKPL2015014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea3be3739d1084fa4bae3d70f34ef2cf75ef99ec4ac9f2ea8b91d0d3f0a50bea. 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/GBKPL2015014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x10d1a82f1a6af8575318c6915ef47d925cc39a8d72881e9a891b0f5d147a5ad4. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/AUVC02339410.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5293f8e8ca3d518b3ebe97bffbdd013ec2cceaca9ba0ca93570c70a43f9a4717. Chain 2 (Bitcoin): anchored in block 959018 (2026-07-21T14:12:28Z), 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/AUVC02338510.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa38058617b92051bbcf576c265f7cad7289fe213c0e36a8b3fa97f50d77ec71f. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/AUGBT2480065.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56c1da32522b648c2eec0df150d529df0969429ca042609569b16e17da7058b2. 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/USUS11700342.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e266fe4bf0f83ff7275398f52d21c3d2a1482062cb3bc9858b0602d2f71a155. 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/SEYOK1812002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab61e46d799fc2e3c36f8cc241d8d5f26a3204ae03e14ba1afdc48530897f227. 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/AUNV01600786.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a1ad0b9bbe7a1568a1776e3d2893582a1d6177b6fad4741894c99ad802ff2dc. Chain 2 (Bitcoin): anchored in block 960095 (2026-07-29T11:07:37Z), 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/AUNV01800143.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05a6783924346535013a84077e02f012b5383d03b1108264cf7f0e9180e8a203. 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/AUNV01700303.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc6dffd04a6956f67493bdb4db5ca7da0935188751f21cd9997414bc7bf9a4714. 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/AUNV01600863.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab61e46d799fc2e3c36f8cc241d8d5f26a3204ae03e14ba1afdc48530897f227. 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/AUNV01600786.