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 0x7b36810c494f6cb3837c6a17ea7824db337d295ca8dc326e5f2c9bc546855a28. 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/82b001b1-ea35-4c9e-8a28-1fdb03d04be2.json and https://artists.proofprofile.net/proofs/artist/82b001b1-ea35-4c9e-8a28-1fdb03d04be2.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 0xd67fd35730a506acf7474ccadac5ae9650e7fd3f643a851805699eeda08f168b. 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/NLRD52266024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86f36b511d5c540831f9ff67cbe8b46ab96c5c73d862cde1fb605ee451000aaf. 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/INS172317022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0da234ff12f28bd47767c26160193498440ef5d2e7f5b7ccaf4f65f67fe893b7. 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/INSK92300207.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6591e439003d13a10fd6d0ce968784de397ddb7feaea970418fb27d2df77a05f. 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/INF252300197.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8176959ebde17cb82b897cafab85d96401846627d80ab989be513a47d9eaa8fb. 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/INF252300029.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29470be69eced6d4ea023a19cd99797c5994efc856ca60b7a23f77a45f087113. 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/INF252210099.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf588824a5b70193ab1c5b05b071ebc8b8e7c3ab1e4a73fa577f1fcb2c9142f51. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/QZKDK2267739.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc660952f99fab6b5049439fb8b37e6deda34d48d2796442cc87d0189dca22de6. 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/FRS182131879.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf722e2c79de5a6e8a56ab113d5e12801a81e24b19807df6449909ceff7fcf23c. 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/QZS652108724.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6248f3715f389dc004fa116b822a892e168734bb8dcc8b10044c09d525d94c7a. 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/INT132103428.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a295f9eaf2303544579decb5b30e8d58afb78d6261917402f456379e7e0b7e9. 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/GBKPL2280318.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98fd350195a4de9f3c6e6695b45ce4f6d7c04e60c45c68b801d8e268632c3668. 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/QZS652162738.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc6339d121eaef489a5b5fc71cce9bcdb7b73a6c3e0d44c7bf7fdb9e839a01c91. Chain 2 (Bitcoin): anchored in block 959137 (2026-07-22T16:33:46Z), 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/QZS652178649.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x866f2abd0aa006a4b3172658b21740d9efc4460c60c5490bf2979cd38565f298. 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/QZMHM2028960.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x682cf297cd7769211408040561d9209ce9635d3a1af8ce9416adebf35113267c. 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/NOG842302080.