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 0x46bc53e533fee77047af9ca5206c4d07c4465ee828f38cb4b56b8312f745c19e. Chain 2 (Bitcoin): anchored in block 954066 (2026-06-17T08:11:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/77a8630f-82b9-4f3a-8188-4b24ddca077f.json and https://artists.proofprofile.net/proofs/artist/77a8630f-82b9-4f3a-8188-4b24ddca077f.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 0xbf176b3ef9f53b3b8e9ce2532f19fc6451fe63aa7d138c78ae33c38326df3d11. Chain 2 (Bitcoin): anchored in block 957032 (2026-07-07T11:43:09Z), 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/ITE911632101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2ff005f19c044cd9c0c8bdea553141d197d43d109d7ac0bf4dfd8b7dc540daf. Chain 2 (Bitcoin): anchored in block 960218 (2026-07-30T06:57:05Z), 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/ITE911632102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99826b299bed6719d15838e2dcfc55eab506ab970a6fbf37a4c032aa0d0bd9c5. 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/ITE911632103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7eaec482de9ab21064ca902a55fa0d9e1a3e28cecc343200c2f9636f14dc35f4. Chain 2 (Bitcoin): anchored in block 960258 (2026-07-30T12:45:34Z), 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/ITE911632104.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x145b860f819d8a99503d6701069fede4c9d142d202335cd076226deb0f7db6e6. Chain 2 (Bitcoin): anchored in block 960302 (2026-07-30T20:09:33Z), 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/ITE911632105.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa70e9671ea50e9cdbfd611ea34b1b183be48f9a5c8bd6c5630ee154c6c51734f. 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/ITE911632106.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd68d9df497df189d3c891c99e43f42ebea524e43962726bdb002716d2606c535. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/ITE911632107.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe35313ce8d572b2fb38c12219fd6a04b44acf32e3b279595ef3a8cecfc9b48d4. Chain 2 (Bitcoin): anchored in block 960198 (2026-07-30T02:21:55Z), 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/ITE911632108.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90d4474a2b4cd7b71c8e3b12414c04a361b6b256c6a83a55145be46316efaf20. Chain 2 (Bitcoin): anchored in block 960199 (2026-07-30T02:30:29Z), 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/ITE911632109.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b87dace889ab9e0e3ee0d0c4d3904890226642b5254eb71ae9559162c6a1704. 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/ITE911632110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a14a28368f5e902d13d0fe6f6d67ad51b7ea6933ee2460fad6465ad5dc8cf3d. 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/ITE911530259.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30bd5e7649dee862904a1584f1dade45e56cfc77b40eecb8a5fa5618782c388d. 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/ITE911530260.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f0187428d518da4c529a968d578058e0f6a97e37d1a2526a4d0f8897f0799ee. 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/ITE911530261.