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 0x207a8bbf3633e1e3e4af80e5de40d451029d5c073212887eb692857f8d78349c. 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/2f0fc024-e521-43c2-a17d-2f538db69726.json and https://artists.proofprofile.net/proofs/artist/2f0fc024-e521-43c2-a17d-2f538db69726.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 0x69e3743057930e15d64f418bc81f33b2cd5649d970e483a283f1c4dac56ce950. Chain 2 (Bitcoin): anchored in block 958349 (2026-07-17T02:28:59Z), 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/MXUM71602113.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac24c5a35ff950ef790b6c1bc03027812e8b95f08b605fa8a62f3c1d1901fc3c. Chain 2 (Bitcoin): anchored in block 959087 (2026-07-22T02:05:55Z), 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/MXUM71602116.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a1a9ce5e3b8aca76857f37220c73421a28840d8222c5917af95a3be550e6a63. Chain 2 (Bitcoin): anchored in block 958563 (2026-07-18T14:29:03Z), 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/MXUM71602115.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x755338f6f194531002605920caa71dc81b637bfa1757b7cd2fd2482c8f9f0da6. 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/MXUM71602120.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2bbbc37cedee272c0e8b6ebfe8294fc21edee4459d41c22520e79e1409f78d8. 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/MXUM71602121.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75979e62f4d23923d98615be2d1e0d71e6b1fadb177ae3a8644792e790d083a7. Chain 2 (Bitcoin): anchored in block 958991 (2026-07-21T10:04:40Z), 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/MXUM71602118.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74f3f14c31853b202d8b24043b186c0c1573ef29d74bc00d5473227e2838bafd. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T13:14:32Z), 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/MXUM71602114.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2548cd70201ae54ec4cb85454ff6fc7b0a6407893c3a5f2f40240c8ebf64e447. Chain 2 (Bitcoin): anchored in block 958714 (2026-07-19T09:51:44Z), 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/MXUM71602119.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27894668ed301fbd05f79ec605d5b3b6ba08b35145fcec761f22d31425560a6c. Chain 2 (Bitcoin): anchored in block 957720 (2026-07-12T15:26:09Z), 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/MXUM71701828.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27894668ed301fbd05f79ec605d5b3b6ba08b35145fcec761f22d31425560a6c. Chain 2 (Bitcoin): anchored in block 959118 (2026-07-22T10:01:58Z), 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/MXUM71701828.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x988fe74ca2c4fd972bc6006a5ef5109957cb45f7af21cc29aaf9adaa7d1b997d. Chain 2 (Bitcoin): anchored in block 958959 (2026-07-21T03:51:22Z), 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/MXUM71702138.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58b9201690f63b6cf0a093ae1be2a414087e2818593a8a5a7bf563fe02472f98. Chain 2 (Bitcoin): anchored in block 956402 (2026-07-02T22:05:07Z), 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/MXUM71801215.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3aa8d1ce6690476cc94a7d805803c7c3e8254c06bde6b23d0ed0727aa18ca186. Chain 2 (Bitcoin): anchored in block 958708 (2026-07-19T09:08:25Z), 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/MXUM71802132.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b8c728f2616dba43d554f7794502673d3ae27af2468f7183187c169c07d255c. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T05:29:55Z), 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/MXUM71802133.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb54bdc7ef20fe847306d1d1382fc14da6618c832a67ff360ccc06b2e6947c00c. 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/MXUM71802134.