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 0xa827a423001a0d3d19aac3636c47a8ee1652afc9855d1f0a5e8f2c0c430a7035. 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/5c7bf9c8-0a70-47b9-b4c4-668c2e000279.json and https://artists.proofprofile.net/proofs/artist/5c7bf9c8-0a70-47b9-b4c4-668c2e000279.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 0xe1ea2008a6f5b80f631cd9ab525810c7f569312eaeca3c41953002965a47b4ec. Chain 2 (Bitcoin): anchored in block 958176 (2026-07-15T19:49:12Z), 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/USJ3V1429158.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ece081d4a092d558100b37a1fb22726d31d5355827b40b0462e6e23af4df149. Chain 2 (Bitcoin): anchored in block 958613 (2026-07-18T21:35:09Z), 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/USJ3V1429159.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53c73aa3ab542d1b982c16e67ee91ecda41fe3816222a00eb9d67388cb3f1aa8. Chain 2 (Bitcoin): anchored in block 958838 (2026-07-20T07:01:21Z), 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/USJ3V1429160.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f7eb281091ea2b65b17cfef86f340e0b2bf6df45204462fa09aa5d266b35642. Chain 2 (Bitcoin): anchored in block 958924 (2026-07-20T21:09:42Z), 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/USJ3V1429162.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5aae6c3787bfef920d1b79585bc982b51374716d330a050a3013a55f168f818a. Chain 2 (Bitcoin): anchored in block 958943 (2026-07-21T00:27:37Z), 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/USJ3V1429163.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0dbe074fd4f77391dfefae5648b52117c6ec2e4d33c5faf933f5755671426d63. 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/USJ3V1429164.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6da180c80ebdd6928f3329ff3da9369e9676a6c641f8bd6a185d69a560f06cf2. Chain 2 (Bitcoin): anchored in block 958621 (2026-07-18T22:59:44Z), 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/USJ3V1429167.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6461a78bcb640d4989825e0958860f0b2235cf5387f6cd29bc4bf1859badd3a9. Chain 2 (Bitcoin): anchored in block 958943 (2026-07-21T00:27:37Z), 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/USJ3V1429174.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8879d4a59f2f372f43a823d00635a550d5a685bf73c14126b89f0a502aeb05a. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/USJ3V1429178.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77dee0db83f9bb124b49d4c960dc5515c6296571df54723524d9fbe348438bd8. Chain 2 (Bitcoin): anchored in block 958911 (2026-07-20T19:20:52Z), 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/USJ3V1429187.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb7fa452d6991905579bf61c8045302e43abf74558c5f4b9d36f75cc98a4b217. Chain 2 (Bitcoin): anchored in block 958211 (2026-07-15T23:24:33Z), 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/USJ3V1441696.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ad7264d50f77632758313d87d470f96a66c94be187d30327a0f8237aefec33b. Chain 2 (Bitcoin): anchored in block 958276 (2026-07-16T10:20:17Z), 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/USJ3V1441697.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26af847a6dbd09e14f891f991dcf444f0cc0529be98b7a407277e46c1f7180e8. 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/CH6541972838.
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