RPN may refer to: Science and technology Real projective space (), a type of topological space Reverse Polish notation, a.k.a. postfix notation, a mathematical notation Registered Parameter Number, i
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 0xb49257183ff247d495bd58dd74fc4ef9a797f7b83a7006cc7ebae2a03969dbd7. Chain 2 (Bitcoin): anchored in block 953654 (2026-06-14T16:26:51Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/4928f41f-0d1a-476c-a461-6af3db26f2e6.json and https://artists.proofprofile.net/proofs/artist/4928f41f-0d1a-476c-a461-6af3db26f2e6.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 0x0ca651167880385c84748ab02ef41d9d850aedd51a13b90dfc6bbec55c835652. 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/QZS642271932.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd77022796f891ea6e51dc2f80f92e41f23ad93778cba9002dbd5e482f30e70d4. Chain 2 (Bitcoin): anchored in block 959047 (2026-07-21T19:17:28Z), 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/QZS672228175.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a5cb4c2e09d795f927d16c30d969d7f5e18aea69abbe4fe52f4ffe86834736d. 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/QZS652302382.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1031cc95a8050649ce82f105a0e3f7631abe8e36616b3e39a8607c30cb84a5c. Chain 2 (Bitcoin): anchored in block 958885 (2026-07-20T13:01:04Z), 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/QM42K2304398.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50250532ea64e0e143f390be8ac3a4f35ec5a16e4318ba80e77bcf22dbe3a96a. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/QZS652396872.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53bdcc5bc8861878a4ccd5b9cbcba041b86181ff1c0b8b22a2f29c6a2d206ebd. Chain 2 (Bitcoin): anchored in block 959073 (2026-07-21T23:25:37Z), 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/QZS662256457.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8c90e69d7e9cfb8242839b820bc141019eb2e181b8a176f84907b567796e3a0. 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/QZMHN2412436.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ab15b84e17df227056ce92437b50e8d70bc44ebd44d8584afc7f54818d70dbb. Chain 2 (Bitcoin): anchored in block 959105 (2026-07-22T06:33:30Z), 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/QZMHM2578314.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b1673688b446d1a417c3cd99ad54fe9c44eb9fe3986e14da9896309cb9648ba. 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/QZS632567661.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x682aee8beacb2fab8a2275328f5f951c9cc14bb29046ba1c2109c539a6fa17e8. 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/GBLFP2543608.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9ba49b478c43eabc45aba39fb105ddfd0e819fe25af7b8597bc0de04cb90f1e. Chain 2 (Bitcoin): anchored in block 958185 (2026-07-15T18:19:04Z), 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/GBMA22585004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e7747d9de123471fd5756f917d00ca4eb7544069db4b2fd8b36104ea5f31562. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/QZS652511932.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8658771fe4af72e8ec202a91c4fcc9089817a2ff109adf043b297d9f48253220. Chain 2 (Bitcoin): anchored in block 956776 (2026-07-05T10:59:37Z), 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/GXHUT2547321.