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 0x70fbd4a273f60caa23ac507fc48ac46710003745b2ecbbfbb2ba29979c5307e8. Chain 2 (Bitcoin): anchored in block 953592 (2026-06-14T05:36:59Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/052ab52c-d8d6-47d4-80db-17a35580ebcd.json and https://artists.proofprofile.net/proofs/artist/052ab52c-d8d6-47d4-80db-17a35580ebcd.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 0x5999ccda1f92d8b125ea6c7b5b50e518a03c33233e5a4034d2bc4ba8f2be6325. 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/USX9P0789692.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b27a284f6301aa6c199df7349a20ad93edc6f3d3c2cd0b40e698987480faf0e. 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/USX9P0789693.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0f455f0fd7f73513afc227dcc143e5597ac90896c1a57715e688e7d29d82b64. Chain 2 (Bitcoin): anchored in block 960379 (2026-07-31T09:25:34Z), 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/USX9P0789694.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x313c92e100ee719fd54cffb7e5ab221c24a309b32086b7cad40192e84885c8c6. 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/USX9P0789695.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c0cba605d77f5e1d491b0d4e04a589cac5dcb2b31ccc97cab910ece14b4e36e. 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/USX9P0789696.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5cfc39e32c655454209f7ad548358327e705d96b84c6a782646bafa70ed5623. 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/USX9P0789697.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81858fced188c1d80ee7c034eeb3b2c45a361f90ea7e9457b473946bd499b61e. 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/USX9P0789698.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60ae3f9b7bae11b16f447d88a97b57603f0a441a650ef2dae0e0dfad7d2504d3. 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/USX9P0789699.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd139d99e07d7b40d7073f90a8eb70324b213868c7715b80bc962e3f135f4cdef. 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/USX9P0789700.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0698d7285f2494ca956b2875b408942b6dd3ee1d1736c4e984c4cabebc8f268f. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/USX9P0789701.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1963b92d5a77719d7a03fb0b6d417a0b5717f79dbd025539db2bf8023ea49b4d. 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/USX9P0789702.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4bf7ad9e26f53ae9f572a41569c87fcc4cc1f34f0f72c6738fccb55177cae85. 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/USX9P0789703.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35683b905d9e607e771d4936fa05238d4f6eac9bb90a79de0610d7d296226832. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/USX9P0789704.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d6eb07949c856c5741572f3c87cf13a4b5d4edf31424c77bd8fc43f2dcd0009. Chain 2 (Bitcoin): anchored in block 960259 (2026-07-30T12:51:24Z), 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/USHM90822426.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7478348c76dbb0402678bb5a909c8352dc9b2dcf7e858afff7c0612e87427ce3. 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/USHM90822428.