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 0x0d6056ccd55f796dfd720f667198e3c904167d263337543a8b87588476e8c762. 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/f5ca9a71-ed13-49c8-ab95-d378be5e2f49.json and https://artists.proofprofile.net/proofs/artist/f5ca9a71-ed13-49c8-ab95-d378be5e2f49.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 0x7402d9f64c5d4ba39db1f09328dd8dd4160893451dbed1250b2b0564f86ec787. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/GBEWA2303260.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd79af47af11eb3d9d96a33208bca57157b6e6788631381ffff6ec71b1907d4d3. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/GBEWA2303269.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a8ac9f9876cf07205896fa2e7e7acada2f18cea99ab9da24b92dc384c0c480d. 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/DGA082337046.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb54c52b2004a9f983c56bb0d802275317f63f5fb99843265fa5f8f04070bb8e6. 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/DGA082337044.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa06481faf0336c7c5ad21f469d98b5bc2ea41561e6974509361e909eadb06137. 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/DEXW62300181.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a16c44b857341c13358acefeac7336d8b21f19008f13ad221fed2b7687429eb. 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/GX8LE2312742.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x587a808f3a3c7a96ab11ccb5bdf16c40f43ac1f738d841d251454578a1b402c8. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/DEXW62300104.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb11f98dc6f417ebb7d73616549e369de774003b89ab6d5a5588f35f94ce5309d. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/QMBZ92271596.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7bf8b0541a2a01cb38ceb7bf606ec8d9ebf3d00711d8433a454a7cf78b15b459. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/USUG12206037.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57213d1569d7b84be52a22b49867292fc35869dfe7ddb83d706b09c1f1e229dd. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/USA2P2227777.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb70d5716c0c05bd9a06d876eb924ad40d355b613ccfa008e62351274e692709. Chain 2 (Bitcoin): anchored in block 960113 (2026-07-29T13:38:16Z), 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/GBKPL2201257.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3564de2da2477a53746ce3e179757e1b6a3ec9c32695523e0892d9acfd871849. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/SEVWR2202201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x80ec9937446bb63f614fa6fe16027065092fc708ac2f937faf2afc4f89d94b08. Chain 2 (Bitcoin): anchored in block 960181 (2026-07-30T00:53:20Z), 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/QM4TX2273738.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4bdd8088585c38e935c6251e270e24060123e11227ce9ea25bcc2df36a990fd9. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/GB2LD2110406.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd95770af380dc098bf94de2c635217c656c214f1b479893c280187352cec7d5. 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/GBKPL2174841.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7bf8b0541a2a01cb38ceb7bf606ec8d9ebf3d00711d8433a454a7cf78b15b459. 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/USUG12206037.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7bf8b0541a2a01cb38ceb7bf606ec8d9ebf3d00711d8433a454a7cf78b15b459. 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/USUG12206037.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7bf8b0541a2a01cb38ceb7bf606ec8d9ebf3d00711d8433a454a7cf78b15b459. 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/USUG12206037.