thumb|300px|Map (in Spanish) of the taifa kingdoms and the Christians states at the time of the breakup of the Caliphate (1031). In medieval Spain, parias (from medieval Latin pariāre, "to make equal
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 0x7b9c4badeddf1215f6eec0e0bfd7f3c5c1db8409f7c9933a3dfc80f9de97c473. 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/1ea019b6-d78c-46ee-8ada-a584efc05da2.json and https://artists.proofprofile.net/proofs/artist/1ea019b6-d78c-46ee-8ada-a584efc05da2.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 0xed38a2aa2cee64e85dde0446f7888ff9764ff7fe8a0ef752f203740f1bdfb3da. 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/PLUM72000308.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc9d483f62792bc02ad468e5389bce6e29c93e7ef4c1139d4b46d77132f69b8b. 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/PLUM72000309.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5139e8263eb8da29e320c1062768690e42f05e8f4c14bccf9d23bbcb98c759cf. 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/PLUM72000310.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x815e18ce89f4be46efcdddbd1163f120adbffc1a0bd10ea78b8c4f29310e780c. 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/PLUM72000311.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19536fd560c52e0ed1ffa731a696ed9c69d2a0be7c593a9728be12ff5f44bf1d. 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/PLUM72000313.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b5823322dc0b4352f66b28c97ae3bd7d8b47a46240138f479214adf983cd57c. 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/PLUM72000314.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30e428ca85725b1c59a0cda76789fb27e9f5095f4ab14d5131a9e73e91087f6d. 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/PLUM72000315.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0829bb339526b60da1167cadb212854847e4b96e396048752089625f9afed15a. 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/PLUM72000316.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0969805bda643f5cd54e3bc6da8099a36bf782ffb13fdbadee480ca1daa44589. Chain 2 (Bitcoin): anchored in block 959152 (2026-07-22T19:02:01Z), 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/PLUM72000317.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56d255cf469749f725755ac672c20b4bf99e1c64c33a2c1b6ffde9c60a7323a1. 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/PLUM72000312.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0180eedf9b1bdf669edaa38b99308fe979c43bbb2fa414926e48b20cf90c7fdc. 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/PLUM72000319.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78c931c63615835ceabe7b5c7df538b32844f4bab6788e8d46ece648b854aafc. 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/PLUM72000320.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x434795368442dfe6e08147e6db0fccf42cf023efa339bdd75a3648d4a0e2849a. 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/PLE951100228.