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 0x202d25e2598fe411ef30dd7062273587cbe64ff56faef8ff78018f4fe94a64f6. Chain 2 (Bitcoin): anchored in block 953803 (2026-06-15T15:41:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/e49507ec-0590-4bfd-86a2-c6d1c17258d5.json and https://artists.proofprofile.net/proofs/artist/e49507ec-0590-4bfd-86a2-c6d1c17258d5.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 0x2f471c183135ec9703baccf8985aaeeb088f739abf45f9d4ff0e80adb5b2182a. Chain 2 (Bitcoin): anchored in block 958087 (2026-07-15T02:56:49Z), 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/GXF9Q2473643.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc23027f838e7464842085d0da782cce1ad628343434b71f5afe76a76bed00cef. 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/GXF9Q2473637.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47c87b76c66e2d7976e4e4623eea32026f3fe4fc1797ceb48115087270688b35. Chain 2 (Bitcoin): anchored in block 958331 (2026-07-16T21:55:37Z), 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/GXF9Q2473638.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc533b8c991b106e4149e237fc673e4f62036d8f5795b72ea89ed421d5a8d9ff5. Chain 2 (Bitcoin): anchored in block 958115 (2026-07-15T07:27:09Z), 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/GXF9Q2473636.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x852321ce7a8fa88da65d8a1773eef0bb50a4c36f713f976e74e3e5874995e513. 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/GXF9Q2473635.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90df96bfe6c201a06914cdb6f5ec40564d235e6b561055a58c0557e53406b8ca. 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/GXF9Q2473640.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3202741c4b0224722295aae7ad3659d67a336601249a8e35da9f4362cfc22622. Chain 2 (Bitcoin): anchored in block 958095 (2026-07-15T04:30:08Z), 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/GXF9Q2473639.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc6374b0c30271af034bf2baf05789b1bf8245e225aeeefa3024525d6f78a9788. Chain 2 (Bitcoin): anchored in block 958180 (2026-07-15T17:59:52Z), 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/GXF9Q2473642.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x898f83ee50d3f682249967f4251db3ee290d03f0c91d4fed4586a13e40b4ef0d. Chain 2 (Bitcoin): anchored in block 958153 (2026-07-15T12:03:04Z), 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/GXF9Q2473634.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90ae756790f86c12a85070b7abf6432a547b2f7b09b04e93c932a3049aae0060. Chain 2 (Bitcoin): anchored in block 958185 (2026-07-15T18:19:04Z), 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/GXF9Q2473641.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x142db04b4187139b254db42b74bb384c36fbd4efd949f1e40ec2d2a6ed05318a. Chain 2 (Bitcoin): anchored in block 957770 (2026-07-12T23:17:00Z), 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/UKXN22549169.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb177f06a8bac96c66fd347a1ff88433e5c570fdcfb0218fa4817bc1319f01fc. Chain 2 (Bitcoin): anchored in block 958095 (2026-07-15T04:30:08Z), 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/GX3Q92583033.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f3dd0a7958a1bcba3b187236c7564009609d8e2fe041812f64bab3f439ed6c4. Chain 2 (Bitcoin): anchored in block 958600 (2026-07-18T19:24:05Z), 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/QZWFM2512037.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcfac1b0626058bbb29f75679c5c7a800bab044414e2a34d53ff8c68443723933. 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/QZWFL2573418.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1c549f0c41637f479b338c52540718d89991345daed7f9739c9dd4026de65da. 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/QZWFM2510598.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb4116df489cd4d9805604209fb78701b68ae01bb01f68a3e3a7a16084d7fb32. 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/QT3FF2583454.