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 0x68958dbf8b0271eb9f10f46c7a00fdf6a0399ff76fa3c39553fbeb035ef19963. 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/a8455362-4e6b-42cc-aec7-05b92697d2d1.json and https://artists.proofprofile.net/proofs/artist/a8455362-4e6b-42cc-aec7-05b92697d2d1.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 0xc02934ada9521754649154abef48f8f1bab67fded61f85f33dfa72cac78a26e2. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/GBKQU2089356.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21adc9547b03a6a586d7c37ab9066c2b4ea17990ae5d436de35006edfb3b446d. 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/UK2X22000204.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0582e56a009013acc98f9fef4188279a72d320f9503cbc56e0bfda2ee447f252. 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/NL2QC2000123.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf56c7619732d9343e0019debfdc31f9321c2d5df5d3f94a21450620b670bed5a. 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/GBLV62040496.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40a79866683dd79a557b5c10e9052229640c58dabcb379db66d825f50d3ab4b5. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/NL2QC2100038.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8dd0df658a36d3c312099b0bd3c9dfcac5daa7245618fd4e6487f29fd4599ce. Chain 2 (Bitcoin): anchored in block 958368 (2026-07-17T05:03:25Z), 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/NL2QC2100066.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1e8aaf3d79e475dd243619580626b0cfed03a0c80aa3b7a41bafe21c717443b. Chain 2 (Bitcoin): anchored in block 958567 (2026-07-18T15:22:40Z), 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/NL2QC2100183.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c32c893892649fea7fcc1cb99755645bf92a4dd400200e79403393785228884. Chain 2 (Bitcoin): anchored in block 958825 (2026-07-20T04:55:29Z), 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/NL2QC2100416.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x344e947cf071a1b0741518b3589efc8470f3a69b815a568e1fc17e9daa0f4d71. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/UKGGZ2200332.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26119f8630ce7aa4b2d2806c0fcad94aec8ff70f33601ad09ce2d4a7adf83997. 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/UKF4C1603786.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfde35ba2d6152367c9b62162b74a7e2ff3b1631a1670a58cbbd3007ff9c01317. Chain 2 (Bitcoin): anchored in block 960404 (2026-07-31T13:06:57Z), 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/UKF4C1603788.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55ffbb2d01998d3afc6ac659588fc0a75d7712bdbf37c27e361a00823415d39b. Chain 2 (Bitcoin): anchored in block 957880 (2026-07-13T16:39:18Z), 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/UK2X22400296.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf466c9da87e29fb4d6163a2167a550eeb7eab4cc3c6ba9bbe6cc0645c0970898. 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/NL2QC2101399.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e6ba4ddd869bce16d740e1da838b765cf6eeaed6acea9d74376765210360409. 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/GBKQU2453122.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c489351b1df32fb286eb94d6af557ccdf40f43428a24028dcdac331a1f82635. 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/QZMEQ2491774.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x270bafaa7e9f90b08e45d5c53a8f43277c824d4d4eb4ca9cf5fea26aac163970. Chain 2 (Bitcoin): anchored in block 958846 (2026-07-20T08:14:15Z), 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/GBKQU2484840.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18e06efdb27c6f77ccb6092066ce006f84a1a8fa41da9622eda4f5940c921238. Chain 2 (Bitcoin): anchored in block 958383 (2026-07-17T08:20:01Z), 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/UKW3Z2502327.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6a32ed9cfc7621baf73929cff635d5a9d4387178675a60d763ea8a01f8f5f76. 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/US83Z2551385.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb545cf3f49b65d79819dd52495b2a396260b38091872bf399f2359a18999a80. 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/NLYK92500460.