thumb|upright=1.5|Marina on Portugal Avenue, Rio de Janeiro, Brazil thumb|upright=1.5|Marina in Fort Lauderdale, Florida A marina (from Spanish , Portuguese and Italian : "related to the sea") is a d
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44ab08941b4908a89a677f2dd3e6b3f82d3a5b8e9fae3927f09a8e7c79f7a1f4. Chain 2 (Bitcoin): anchored in block 953713 (2026-06-15T00:33:41Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/859e662a-67fe-486b-a41f-47d0e47792d4.json and https://artists.proofprofile.net/proofs/artist/859e662a-67fe-486b-a41f-47d0e47792d4.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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9467ede3a24d406fc4150a6a1165db22ce22b9d4e411abc11787786e7d2ebb4. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/TCAGU2339719.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0b4741dce3c66008a0ec542296a4e99968ee4ea5b60f64b29728e5244bc56ea. Chain 2 (Bitcoin): anchored in block 958601 (2026-07-18T19:27:02Z), 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/TCAGU2339735.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d29b40572b8e8c7032d1bb609d7bbc11e9f88f783d73e69956e77628c0dc951. 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/TCAGX2371004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe95806b4e94bff9353a9d14ec4f052502b91e1f2a679f507726754e2a1fb0541. 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/TCAGX2371007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeaa74dca734024674b3a22c964bc8032db3c099c6895911eac817cba3842d79c. Chain 2 (Bitcoin): anchored in block 958770 (2026-07-19T21:05:19Z), 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/TCAGX2371011.