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 0x8ff2d4cdbe9f3d0d05ebf561b2035aab7755c6a0af96472bcf468bc02d180ef8. 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/4c423b84-a74b-426c-a54b-09ae25619597.json and https://artists.proofprofile.net/proofs/artist/4c423b84-a74b-426c-a54b-09ae25619597.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 0x7eb0398116c1e5160bff2cdac169ac0ce29e9d30c5f1572ff160289ad5161d5f. Chain 2 (Bitcoin): anchored in block 958380 (2026-07-17T07:07:02Z), 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/DEZ901700892.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19c3421db93301776c849c2c78fda829906ada7736a1a2b1748d7b278e82de1f. Chain 2 (Bitcoin): anchored in block 958857 (2026-07-20T12:02:20Z), 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/DEZ901700901.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6ebf9548142e87e538f3225e71b202a8d39682c27080c368af04d57c6b5fae5. Chain 2 (Bitcoin): anchored in block 958734 (2026-07-19T15:50:48Z), 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/FRX872163839.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb08abbde9db0d3ae48feaf4c15d7fe789735ea4c92bfa0130e66378ef7ea3f4d. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/FRX872163843.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22859053bcd954875716b77502ffa36c44077c3bd8ddd7e22c17fee35e8aa544. Chain 2 (Bitcoin): anchored in block 959011 (2026-07-21T13:26:15Z), 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/FRX872163844.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15a0ee23dd08f07182404042d1ff7a409591ad75cca73138e66ca50bb95120b0. 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/DGA072236719.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd6e82ee50624fe31d026d84be30c82ffe0d8f7d249408c9c69b422b643c90eb. Chain 2 (Bitcoin): anchored in block 958991 (2026-07-21T10:04:40Z), 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/DGA072236717.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3213d2a4f25e5fd549a0a3ddc7e7fd40b11d52d5c6aa687069e6a22ccfb95233. 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/DGA072236715.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d386c476846b58252dc499ad32536d4cdb110b5fe1b030e10a63e15cf1b99e1. Chain 2 (Bitcoin): anchored in block 958142 (2026-07-15T12:57:01Z), 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/DGA072236721.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xabc21a89555b04fa1e45dc839751c4fc9910f171d8b59a74aaf24e3ca45ce7a2. Chain 2 (Bitcoin): anchored in block 958985 (2026-07-21T08:39:15Z), 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/DGA072236722.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7298460c3d7c14103e0b259f6e8d0dc27e6d0f76315f5e770cb178a11dba2d50. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/DGA052407815.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44549b1c062b641311397b8c71a97d39916e39b05e71f652d3a7059fc5d86989. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/DGA052407817.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72263c12fd0f5ae5f519018cb65ccbc96b2e4ac2384ff4a0f6a844a8629a9a55. Chain 2 (Bitcoin): anchored in block 958563 (2026-07-18T14:29:03Z), 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/DGA052407820.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3e379a389b996eba123cbaa0a8b9ee416e93a0ca170ef323dfa326a20cf0aa7. Chain 2 (Bitcoin): anchored in block 958631 (2026-07-19T00:50:09Z), 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/DGA052407822.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7c051205815551bcbcc42656e63753167a6db45673b3f3b95322de7ac378516. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/DGA052407824.