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 0x016d4c30ff8def3b31af728bbfd96dcdfdeaf08e602ff4c7a78bd2f6fb59c262. Chain 2 (Bitcoin): anchored in block 954555 (2026-06-20T12:10:20Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/ad7c0ace-b500-4fe1-8880-9455ed2110b6.json and https://artists.proofprofile.net/proofs/artist/ad7c0ace-b500-4fe1-8880-9455ed2110b6.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 0x61f26af211118ce47d0cd5cba1550e6c9b6dc7d9e8a9e7ebef31cff7828979bd. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/USDBB0611813.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6334b0749563e5e1b1804dd2fb9b3945fef3560a177afdd92ec73d56bb104b7d. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/USDBB0601036.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58fbcff4e57e66cc27c69054f816d6c900b12c1ca5628a7c1d81fcdf5506a70c. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/USDBB0601422.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89a6b5eb3c9acdefe5d3cd322e78727bb97ff559db378bcd7afd919ee6b78608. 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/USDBB0600688.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55cbb88c60005adbcbefd6c5d67dd9c8d337ba604b00a95e5287e4199c03726e. 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/USDBB0601208.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8bab591b40fb26d45907872bc4c939ad447a94397ff5c3bbc1f5decc016aac3b. 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/USDBB0600302.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea34ab43ce54b82dc0f39d693e92af7020baff13c18f75df6f1e96f668494ed8. Chain 2 (Bitcoin): anchored in block 960506 (2026-08-01T03:50:58Z), 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/USDBB0604549.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8963556d30faffa7c2372b4c5b9bc6cb53cf0397f37736a184ec6a7b2619ac3. 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/USDBB0608148.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54a33bb3c6fe2afc0516d56db8691f7ae75b4366ab3ec1ee75c8ce96901b5865. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/USDBB0604771.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe71a88071f9c8466d1b368caf7b17e967d60ca07628a4ff09a068eb4b0c49be3. 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/USDBB0607159.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x861d77187c30f62b09250bae9c333259951b0e6af6c1dad926be4b3a75634bbb. 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/USDBB0606298.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d17363dae9c4c428e8bd9c9fb2fe9e6a5dffe068037b4b2c8348b6960b56df5. 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/USDBB0608551.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfab992a5c6de8f1572efa5dc25f767ba3534370a0637c30877ac7cc6f1a3c879. Chain 2 (Bitcoin): anchored in block 960306 (2026-07-30T20:23:53Z), 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/USDBB0604974.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x780c6994f4b3a546a1b731fe570a5cbd7a05c7a5343daf31fd83843530f0015a. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/USDBB0607940.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb39caead7a2822a15632a79be38c5fdfbc71b266e32b74b734f26d7ae1ebe651. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/USDBB0606763.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf322596bee86e11045fc6830995ff265698e8041cd4036158cdd498405d40db2. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/USDBB0603665.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe71a88071f9c8466d1b368caf7b17e967d60ca07628a4ff09a068eb4b0c49be3. 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/USDBB0607159.