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 0x7e8dbdcbd441fbf72fa70d81f905d75a25667e81349de34ee10f724efd49a326. 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/7555fcc7-c4c0-43b4-8d76-98a5c5579165.json and https://artists.proofprofile.net/proofs/artist/7555fcc7-c4c0-43b4-8d76-98a5c5579165.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 0x7ef21988d1de68349648bc05b73c84fa797edae9615d6ed6e4b613575cafbd06. 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/TWA770500461.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0fa693eada9e96c99d6e65042727b3c09825939c7818c7ad97a3e4af97626210. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/TWA770500470.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdbf0df073da5bedfe3c15e78e006f83ca762680af75acd8454c1669046c652f0. Chain 2 (Bitcoin): anchored in block 960266 (2026-07-30T14:44:50Z), 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/TWA770500462.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95e3c269c28015312fad59ed4a23e8447a4cdb5a0156a2b20424bca74d1a54b3. 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/TWA770500463.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d32095635085cd201ce892903c55e1d1e8425bcd75e3805f967e4a145fd1c0b. Chain 2 (Bitcoin): anchored in block 960513 (2026-08-01T04:52:22Z), 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/TWA770400257.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc33438edc496fef9536f42867cb521ac3d0187fb1cbfa6f03cb06ab87e69c4f7. 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/TWA770500464.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c0655e4de1ed2e30160bd9a92d85637e86828253b609203f2a76912fd41f1eb. Chain 2 (Bitcoin): anchored in block 960360 (2026-07-31T06:42:11Z), 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/TWA770500465.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78eade66470f7848c50c116d52a174f0a06758c96d127473d9c67e2c44f25d9d. 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/TWA770500466.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d077b6c56f1eb05bdc1a86292d42ce6abddb4d26add177a0676ef637db92653. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/TWA770500467.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ce0dd73990f3ac7194f9d52d3fd8c0ed13d61aeabb785422e33060240401452. Chain 2 (Bitcoin): anchored in block 960463 (2026-07-31T20:42:35Z), 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/TWA770500468.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5929e27d11c92a5d8bac0052563d7314de480d32766d629d15d0b8da53db83e. 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/TWA770400253.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x744cd725f3f0e893c3eea494abb1f278117f9c2ec38a988ae4a8bf52e128c104. Chain 2 (Bitcoin): anchored in block 960309 (2026-07-30T20:35:49Z), 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/TWA770400254.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c7d5bc2eccc62aa62be1d8688b58ba1a881b432b47d39f47dfe6a42eac214d5. 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/TWA770400255.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe681adda1dca911785dcc4947797e8da7639f091d19b8be00640a42fd73947e2. 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/TWA770400256.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d32095635085cd201ce892903c55e1d1e8425bcd75e3805f967e4a145fd1c0b. Chain 2 (Bitcoin): anchored in block 960173 (2026-07-30T00:11:40Z), 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/TWA770400257.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x547cd07292a0f79d804c6a05402c80a2c47981dc08359c6070d52d6c8befe0ed. 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/TWA770400259.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc56965e782ebbb8830658518e49249a8bce0f49ae236f5153a9326b668202da5. Chain 2 (Bitcoin): anchored in block 960497 (2026-08-01T02:22:04Z), 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/TWA770400260.