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 0xf34300d82b7d2ba76982c7d5cad97f027ec098d652b21555f0718e6e36f6cd67. 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/6345d99e-0888-4a17-8b47-499b31566139.json and https://artists.proofprofile.net/proofs/artist/6345d99e-0888-4a17-8b47-499b31566139.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 0x0e801f88858ec675bcd66552a73d6fa48fc736cd72a8869ef6182b3dc685de66. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/ESA112568978.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7d9c01fefc51c0fdaa22fc2ca9506e941c0a43c4f6bed7347840928e3ebe2de. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/ESA112568377.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa621c68117d2499d9380d5922f8b249df6360bee925904cacabca17f644c7080. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/ILTON2503686.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70f73c0086e176d51012453515387e6791665587275132aabaee746d34674a84. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/ILTON2503688.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab42c16c8881c560bd90fc39b9c6479083987c0b810d941d894edbbf22346863. Chain 2 (Bitcoin): anchored in block 960379 (2026-07-31T09:25:34Z), 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/ILTON2503689.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea8589dfa925384331b51a40ddade40fee768e4a8e4c047cdccc897abfa86a3e. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/ILTON2503691.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdbf2e0bec29113cf2dedfe6a6cc115d39b74d905642375f6c9add8c1920603cc. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/ILTON2503695.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a404dabfaac3474c6a61a3fb38407e53a806bd6e1d1746cc4c8b57b4c02ca39. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/ESA112570459.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22617acc6f69ece79630ab82e8cd30e0c8dfa2bec93be95877010fd76bb40b83. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/ESA112566083.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x94c29177aabd4dd9ace0aa890815179ffb42ac85a5584169b1b4d9a2c7bcdd89. Chain 2 (Bitcoin): anchored in block 960381 (2026-07-31T09:50:11Z), 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/ESA112564662.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6b89abaca27ac5b21db7ac9ec75d809ff54fe7c32733f6ac69a571a7758d41c. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/ESA112561242.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb915a51ee3a03d5570e5765cf48928c99e3a143b6da007d9ea62b10ad234e22b. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/ES07F2500032.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7a4dd64bd728f6ba768e4969e471b8c4d549a5a439c6029d091c6bb62d9045a. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/ESA112456304.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x285af2da7bf2913a9ad7c804779d69265e12eddaa97a6286357887249871f016. Chain 2 (Bitcoin): anchored in block 960183 (2026-07-30T01:10:20Z), 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/ESA112452790.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf5a901bb07a90867d59637fd643ee4bf5b69edda7884705461361cd630d11b1. Chain 2 (Bitcoin): anchored in block 957011 (2026-07-07T08:25:35Z), 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/ESA112450571.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0615f944133163ec2ec75879eca6e1464e7c30327d445ecd638355c5968e1a69. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/ES47F2401136.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0ec67050bd43d42762f30dad238ef9f07c03016844df7056efb7f7601d6004e. Chain 2 (Bitcoin): anchored in block 960229 (2026-07-30T08:30:10Z), 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/ESA112565574.