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 0x062151c265f6a8bc3d09b02efcd76d2cb5aa02eb11728de76f7ba729261d93b4. Chain 2 (Bitcoin): anchored in block 953423 (2026-06-12T21:20:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/fa606384-f316-4211-a30b-1df1119dbef4.json and https://artists.proofprofile.net/proofs/artist/fa606384-f316-4211-a30b-1df1119dbef4.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 0xbdd44e6858db46c5d288f96fbc42a35d421963c3ae21d447027caf639f86e75b. Chain 2 (Bitcoin): anchored in block 956637 (2026-07-04T10:56:23Z), 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/TCAFZ2119109.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x10f2aeacfde44f5b25221cb0a8630d98e422a08e3e3674c2cad30dd78decb45a. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/TCAFZ2119112.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b834a9e1bc97439a0c574317e65ac20281171514a7a7bfcef0e21ba0353c06b. 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/TCAFZ2119116.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce133216ce5cf1957aad13a09c2cb8042a9215bf2945f4c6f6e3765f36e53798. Chain 2 (Bitcoin): anchored in block 958422 (2026-07-17T13:35:31Z), 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/TCAFZ2119127.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x09cb996e67f7f9514e12666c1d2e6ad83a79e2917fe44e8fde73cdd57e4e73ce. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T02:01:41Z), 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/TCAFZ2242029.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6adcb3042d3af79487b684d3a1f8d5abb50dd497754f289dd68c16e3c857f799. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T02:01:41Z), 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/TCAFZ2242031.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb12fb5598088f9add2c369bda0c5797ac74f65c79f55fcb09cdf9c702a099837. Chain 2 (Bitcoin): anchored in block 959001 (2026-07-21T11:41:42Z), 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/TCAFZ2242035.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d953740d2c379d8dffc86b67d9108ea61087a53f309c10cc4a75d7d46308aae. 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/TCAFZ2242057.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4478048d53580cb66a4539c7bdb38b3aaef93d8055839955460075f6b6d324a1. Chain 2 (Bitcoin): anchored in block 958228 (2026-07-16T02:46:47Z), 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/TCAFZ2119477.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96986a56896601071521b367f51caed6ca02dce39a28c33f3e13cc49fa3037d4. 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/TCAFZ2119479.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x490b77d01aec66d2fb3aac4beb652ebceb43865a96cc3d263fde33466e81da6e. 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/TCAFZ2242162.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x722724cbcadcc73ff8cc64b6d429d6aa3e83a3dc1ec97b0beb74a121a66c32c9. Chain 2 (Bitcoin): anchored in block 957761 (2026-07-12T21:55:15Z), 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/TCAFZ2119083.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x264c928082a4562365794790e1b0754cecfe642c7e69f24f7c2755caf3efdebf. Chain 2 (Bitcoin): anchored in block 958576 (2026-07-18T16:22:28Z), 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/TCAFZ2119092.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7223e8dcf5b9140ad30db10c1cf7807dd79b823038a1205e2988a120dc07a57c. 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/TCAFZ2119096.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6cba0cd6547478d44b66fcda45afcca3709dab2f1e9d2312f5ace11fc051e692. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/TCAHC2362041.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04d82d35a95aab86e0eb804f9585b8c3738c8511bc8b03b638b9cfd941308851. Chain 2 (Bitcoin): anchored in block 958228 (2026-07-16T02:46:47Z), 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/TCAHW2484359.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8205291f32eb789475882e8f7e3bc33838eaab0aa7c47ebdb562b9a376fb65c. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/TCAIC2407914.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d953740d2c379d8dffc86b67d9108ea61087a53f309c10cc4a75d7d46308aae. 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/TCAFZ2242057.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce133216ce5cf1957aad13a09c2cb8042a9215bf2945f4c6f6e3765f36e53798. 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/TCAFZ2119127.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e81e38c908961af739f156ad00366fb4dc06ec36a7f79920a515fe44cd94b99. 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/TCAFZ2242007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x09cb996e67f7f9514e12666c1d2e6ad83a79e2917fe44e8fde73cdd57e4e73ce. Chain 2 (Bitcoin): anchored in block 958079 (2026-07-15T00:21:05Z), 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/TCAFZ2242029.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61c20fa5a49a751311652fa862a0452cd8cae4b0d7897194d87ec6b162b51d8e. 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/TCAFZ2242033.