thumb|Map of alcohol control laws in the United States:Red = dry counties, where selling alcohol is prohibitedYellow = semi-dry ("moist") counties, where some restrictions applyBlue = no restrictions
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 0x5ba02fc5ae5da617fa90a79a40898e185b319c36b06db0fd491f05b0d43b7d49. 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/858264b8-56ee-400d-969a-a53a727ba3ee.json and https://artists.proofprofile.net/proofs/artist/858264b8-56ee-400d-969a-a53a727ba3ee.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 0x3be640548751d79d350e485d887a20b238982d3a9213c4afa4c8ba7863e48f44. Chain 2 (Bitcoin): anchored in block 959084 (2026-07-22T00:50:00Z), 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/USHM90527925.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69efc70d1120420cd95e456263ecd3343a0b8f00f18c0c70a3e7a809c4b220d1. Chain 2 (Bitcoin): anchored in block 957754 (2026-07-12T21:26:22Z), 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/USHM80566642.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x82911f20e43ae3aa4087959492d8b983895f7a16860227b5ee1edace72d037a0. 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/USHM80566643.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x827a4387d16a2fed1656e69b4590487d4f3b49b99170bd13fb16fa5848c4ae98. Chain 2 (Bitcoin): anchored in block 958612 (2026-07-18T21:29:37Z), 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/USHM80566644.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa393a097a7bdbf40637eccad69d2ccb4a66415e22b369c433c61e813f7393f29. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/USHM80566645.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x14e77d57f783915a74c0de2544b5b48dc6cba6a74de3c084e185f979d27a595f. Chain 2 (Bitcoin): anchored in block 957754 (2026-07-12T21:26:22Z), 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/USHM80566647.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa269d3be572ccefa5b0fe2b9f24312c116601b1d4aacba056aa711ec12b3a93b. Chain 2 (Bitcoin): anchored in block 957754 (2026-07-12T21:26:22Z), 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/USHM21074067.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x855b20cbedd3a80dcc2eed1c879fe6caa0ac7f379807ef18f9340390c0be9ce1. Chain 2 (Bitcoin): anchored in block 959051 (2026-07-21T19:48:03Z), 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/USHM21074070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe92f089b014da4eb80ba45e6b381f8241673a11cc5e7dd48ada9cb52a7313c9. Chain 2 (Bitcoin): anchored in block 958166 (2026-07-15T15:55:19Z), 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/USHM21074072.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ff4db53250e1823c8c4a7e1b2dabe45e6fde1558b9b8765241e359d13c0197d. 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/USHM21074074.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2ef58b0053a0e15c1f5d9fad370595eedbbb2cd8811e134a98a2e444d7365fe. Chain 2 (Bitcoin): anchored in block 958263 (2026-07-16T08:19:47Z), 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/USHM21074075.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b08b49f3f456cfcf7faa491d3eec5e4194afbba9caffcd0bb761c2236038a70. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/USCGJ1650041.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae60f956d7f6bcb1ca5f64fb5d17f533b5c528295e737d7d62bd613d78fe7b00. Chain 2 (Bitcoin): anchored in block 958955 (2026-07-21T03:03:40Z), 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/USCGJ1650044.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a6c7e8b510ad8831ee2334ab46e99746e5e80be42c03eff1173ceeab9e96033. Chain 2 (Bitcoin): anchored in block 958728 (2026-07-19T12:24:55Z), 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/USCGJ1650050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb261b242c4d721393c7eedeedbb1da7c8c03cfff4ca2dd43c308c23bb45b6145. 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/USCGJ1650051.