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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 0x5f3ed357456fdda50771afe6bf3f4dd8fb3642274b3b029dbc304c4be0d931a5. Chain 2 (Bitcoin): anchored in block 953772 (2026-06-15T10:33:29Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/c43ee927-0300-431e-b55d-4fc63b648b80.json and https://artists.proofprofile.net/proofs/artist/c43ee927-0300-431e-b55d-4fc63b648b80.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 0x80418f5d46df62422bc3264c5211c51cac40de435315a0ea4a16640e8c82a220. 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/USAE81277248.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce338d8c4ac830b9137a98744954892f1c81b05b8cc59347e9b662dfdb8bdcac. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/USAE81277249.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8a493fc85950174bf0e7183317c298d761cfc492e25389c95efdeaab96a6f73. 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/USAE81277255.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3ed696db80b340759199ccae138660d7b27897c40fff6f3c873192e3d221b91. Chain 2 (Bitcoin): anchored in block 960410 (2026-07-31T13:50:38Z), 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/USAE81277260.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x874e9b20c91db3ded9d5e7802bc7014ba53877db759cc8e04fd7fd59e2c2bba7. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/TCAFW2188331.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b61a9fc64dc66842828c5f67d0e1e225e189bd86356fbcd408827fc36fabfa2. Chain 2 (Bitcoin): anchored in block 960108 (2026-07-29T13:09:35Z), 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/TCAFX2123200.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe78d2326a0683b1aedc3311a357ca2945645b83c45503b79781f1778e96e73d9. 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/TCAFX2123203.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd662fcf31c54977fc478952637300afd5a9ae24871cc90ea3610702bced7f222. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/TCAFX2123206.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeafc132bfc991be1eb53e73656ce62302fc5003df116b01ab019ceb83afdd07a. 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/TCAFX2123211.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e7d85b6b74253fb48ae44b87ef72d6958eb4c9b3f45c189cdbfbd9d2d2936c4. 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/TCAFX2123216.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e9bbc5f2584106a3d14f019c16ca18525f1a8c52140bcd1ddd4ef513759433f. 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/TCAFX2123219.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1972929ebe4d4e9c8fe105d5d73581036df96d7b41ac81f344c6e2d506b25b9b. 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/TCAFX2123227.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcbb6393d841d8ee2d9efed3e2a351e7cbe782a16481a6d3c4767fb0c4725309f. 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/TCAFX2123230.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b707e3335555c9899ecedde22581e80738c95ff18563d811eb36681c94513b2. 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/TCAFX2123242.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa891f316a84a611941174baf3bd2fa24b37cc65b3e4a52aec8e6ec72d0ebd788. 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/QZTBD2485020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2893e1fd84e69c43da3844ba34b2791d2fa96241e14f0961da6f72d53895104. 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/QZTBD2485027.