Marco may refer to: People Given name Marco (actor) (born 1977), South Korean model and actor Surname Georg Marco (1863–1923), Romanian chess player of German origin Jindřich Marco (1921–2000),
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 0xad96eef036c7768bcac3f48469bbbdb9dc065506ecb9413ad15fcaac59c7c4b0. Chain 2 (Bitcoin): anchored in block 953657 (2026-06-14T16:43:25Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/4e927ae6-8f5d-40c7-b7ed-bb3f127425f0.json and https://artists.proofprofile.net/proofs/artist/4e927ae6-8f5d-40c7-b7ed-bb3f127425f0.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 0x82c5cf102bd9a1a95ce1745fe4b6ad316f4fba064003b766e8c4011c119c46b6. Chain 2 (Bitcoin): anchored in block 958935 (2026-07-20T22:08:19Z), 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/QZMEN2492640.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd6b0076bce81321e9885a07f25f0306008087e328e00791d2dc253961e7ec7b. 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/QZNWU2490265.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xebade1238b19a07596dd36e5d677fc52256ffdb4f98eb8520d1819e23915c82f. Chain 2 (Bitcoin): anchored in block 958568 (2026-07-18T15:23:47Z), 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/QZTB32420676.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ab90ddf71a6c34d485feda70061e2b6f3218b68d936c2dee4e1daefe3f5dec0. Chain 2 (Bitcoin): anchored in block 959080 (2026-07-22T00:07:05Z), 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/QZTBF2493812.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe56336a314b030ec8cbdbb1a781ebe9a292e8712295939521dacf8dacbfeaef7. 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/QZWFF2483198.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98abf355c2c401f82608b0d8f1fe1c8302ad761b69e0b6cff4e28a2779b1f11d. Chain 2 (Bitcoin): anchored in block 958329 (2026-07-16T21:48:38Z), 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/QZFZ32577080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e471af8ec0b1a00534555f53487cc4b889e18c77863075ef4490adb93cf7a23. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/QZDA72577283.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70d8ee131743bf118c42eb92574948b726d177a618104182aaacec3014e89612. Chain 2 (Bitcoin): anchored in block 956396 (2026-07-02T21:01:51Z), 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/QZES82500527.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc531a73049d18691e525bb2f75fb795cc0b817695deb747e31a5e5ad6a8ec341. Chain 2 (Bitcoin): anchored in block 958468 (2026-07-18T00:27:51Z), 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/QZHN42585247.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85967ef4f0617386c68652d799b7fd6af76c1a9ba953b407f7aad77d7cd16756. 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/QZWFH2598352.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe063027101fe810f8c1747ee745c9eb8dec11f7b01b3c3e4db4dc1745d864fe9. Chain 2 (Bitcoin): anchored in block 958110 (2026-07-15T06:57:12Z), 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/QZWFX2528853.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ea5367b1621e84b501a06a7d68a76e958bfef2b919c3f5c7714c19cfd6c1ffc. Chain 2 (Bitcoin): anchored in block 958796 (2026-07-20T00:01:46Z), 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/QZZ7R2502397.