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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 0xcaa57674c96ed44941342f89cad818599f99122a60fda1b5b8ab64f3cd9c2ecd. 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/8a2638b4-bf1c-445f-b689-dbc24f118842.json and https://artists.proofprofile.net/proofs/artist/8a2638b4-bf1c-445f-b689-dbc24f118842.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 0x18b2ccd40cffa37257e7269bf4b449cd479d76814eef50e18bb2dc8acfec6b1e. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/TCACE1578481.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1979a44a9c90bb4402060b7adda3f41c8958975401031d3e2b75e52565746c5. Chain 2 (Bitcoin): anchored in block 958996 (2026-07-21T13:04:21Z), 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/QM99V1504605.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30719edeebf355e4e5a45cf9191055a223cc461eca689572dff5837f81a16a94. Chain 2 (Bitcoin): anchored in block 958975 (2026-07-21T06:12:52Z), 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/QM99V1504606.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b65c2dc3e98831cf1a7ddac3e80ee48b80dcf030f852d67903fedc0478a7eed. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/TCACR1660575.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb136bc78c1886839f0cdbba2bf61f157c423a89243c2742681efe34d0319b8a5. Chain 2 (Bitcoin): anchored in block 958987 (2026-07-21T09:04:56Z), 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/USDY41766791.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5352891f3e42da5f019a871ef339d7312a10bb1afdbf1c61b73a5c8281909c4a. Chain 2 (Bitcoin): anchored in block 956425 (2026-07-03T01:28:11Z), 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/USDY41766792.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb9d8fdbf141dd3f5d400e8d5f324edac36d96d6e13656212205610cd4d567b1. Chain 2 (Bitcoin): anchored in block 958271 (2026-07-16T10:46:34Z), 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/USDY41766793.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0822e560dde98ae9eb5010f7afaf66d6436f14d56340c66208316ae07bf59a2. Chain 2 (Bitcoin): anchored in block 958690 (2026-07-19T07:14:39Z), 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/USDY41766794.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5923a44072f7753d2a84b428d382cdbb264f97682e128cdabd025611c4f4b8ac. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/USDY41766795.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81144a17c7cc12a2c5a1e2bd5757fa846011dc42dd4ca94499acf2b0830ad252. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/TCAEA1803655.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9339954ef18ea4b7e2bd6e4171e4c2ebc16bd7646a6619f7600d90ad65c8d58. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/TCAEB1922001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb98ddf3fa597a51747494aeaa8b21a984630fbb4f3881a58e5d6ba6e1f19c3ec. Chain 2 (Bitcoin): anchored in block 958823 (2026-07-20T05:25:43Z), 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/USUM71918787.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdbb7e822104cfdd5707decc26cd8939ec671a1aab74ccfcf279df2144d782d31. Chain 2 (Bitcoin): anchored in block 957788 (2026-07-13T02:37:37Z), 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/USUV71904477.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x040fb76a81ad37f8aeb933ded8430bbaeea0f145c26c5cc38009b136e272e98b. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/USUM71924029.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3add158d2649d2ec5de7de1d9a2520caaae6b1f7f63eb09e4ca8b1b1235f207c. 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/USUV72000538.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa944eb489509b8c210b429f95183d2b6c3b2bc504fe4711411516b6e8c7df745. Chain 2 (Bitcoin): anchored in block 958746 (2026-07-19T15:36:35Z), 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/USUM72004809.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x957b7c0c8c6acf2c9ccab99a31e47ef318b8409eef4076f0da9e3adc03ce7712. 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/USUM72012058.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c2cc6c837cda0b2978bf33e16bb84db5e89084398acf86bf90c37165638dcdc. Chain 2 (Bitcoin): anchored in block 958977 (2026-07-21T09:10:47Z), 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/USUM72023331.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x955e6a4d4b623734d7f3b03c2809b820b1158a3c1a918d00c5c01d4f97f12a5f. Chain 2 (Bitcoin): anchored in block 958455 (2026-07-17T21:28:36Z), 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/USA2P2126492.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x215bdabfe14dbcbad9a83b25b74b52c01057d8afae79773873df9eef93b4521d. Chain 2 (Bitcoin): anchored in block 958955 (2026-07-21T05:11:02Z), 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/USA2P2134683.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa70b14e14e2de3eda5bdc6c94513fb81bec26da76acb24c284c691f1181cab76. Chain 2 (Bitcoin): anchored in block 956857 (2026-07-06T01:26:17Z), 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/USA2P2161531.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23d9880d89acdadbf013da6ce28ce89cb05fd3164de943dc32f952222ae471e6. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/USA2P2237980.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa44a2021f8ad25bba89d4b984f9e89b2419f220a89f386d3e67a675c8aed4784. Chain 2 (Bitcoin): anchored in block 958349 (2026-07-17T04:39:22Z), 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/USA2P2237982.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47bebdece866d907adee822ba090227ee15be41fac1aa12699c095005224fe0f. Chain 2 (Bitcoin): anchored in block 958263 (2026-07-16T10:52:24Z), 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/USA2P2237981.