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 0xc74922f4958d1be6b37e27851f02c5b77cf83b67898c9c84ab23e1e381e835fb. 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/d745ca8d-2144-44a4-9d50-b060165120e2.json and https://artists.proofprofile.net/proofs/artist/d745ca8d-2144-44a4-9d50-b060165120e2.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 0x1226fa5432b65291be5a219b53157faa3c4bafdcdaf1a021bda0331b8e3c2f35. 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/FR5R00909930.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4452f2fd18966c690bcc7feffca44d2c0adb39c1ddd9c1c456344460992cbba4. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/CH6541976270.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ee8085310d87c77c7cc5790af3f83edbd74f98725e5e25d7a96b688a2dc9cbe. Chain 2 (Bitcoin): anchored in block 957888 (2026-07-13T17:43:59Z), 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/CH6541976274.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcbe17ec47cf81d41283c1f72e0a3a68062f4b8feb3ee1ea5eb8b0e8f7d29af27. 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/CH6542128905.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf66b980420d5e64c8dd9186018880c8777614ee9302bea64298677f1c9b2bd62. 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/TCAHK2376667.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd624de0c9509983f65f97affbb9949f7588fddc3930fa68d10ee31ae7cd6ffd8. Chain 2 (Bitcoin): anchored in block 959076 (2026-07-21T23:41:40Z), 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/TCAHK2376684.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e7774ec0e6632fe3a00ff625b64cba905a7fd69aec83cf718f6e307f93ce819. 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/TCAHY2468981.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa57d043316fed4d21584ed2dc13bb211131a198a0dc1af7125c6461c332ec630. 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/TCAHX2487604.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbed9a9cf44daf241f7245718687c18a02b7ad8bf4ad311e1d5db292ce0dfaefc. Chain 2 (Bitcoin): anchored in block 958728 (2026-07-19T12:24:55Z), 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/TCAJH2593357.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39f001c4c4881eca4909e83d104003f09451759197f632e19cfbb51afcc096f2. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/TCAJI2574672.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07249a7813d04177d34824ca3c34dbdf785b49e0a3b7949c6b9b8884ece3f87a. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/TCAJL2546170.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c3f580699187fdf120d7e44919b108d7f36ae27d492254103f142852bf15ddb. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/TCAJL2561070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd1abea7ce1b59344ae9a03983cd7dca794a693429f7f616fb3c973a18f019e3. 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/TCAJL2561201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53581d78a82c31e7720e075e2343942d7f7786af2d7503b4e8265443739d18bd. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/TCAJL2561182.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75216bd9d22deac4fbc71565a83c09df116bb2e46d7b1c58ff8f046fd66e8d81. 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/TCAJL2561134.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18baed0a2691e9a7f32c806af475700a63bb8b7c11e1493c5566e2f213b5c3a1. Chain 2 (Bitcoin): anchored in block 958828 (2026-07-20T05:21:06Z), 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/QT65Z2518133.