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 0xd6e5326f216f6342ba7d44578bb529b1c09314b60f186961940abe8eb8fea635. 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/5bc5079c-e949-4570-bd61-a0fe6f673982.json and https://artists.proofprofile.net/proofs/artist/5bc5079c-e949-4570-bd61-a0fe6f673982.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 0x7536c663d5453156938f00572c05634fd7b9c46a74947046aa40308a506eb54b. 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/USCRB1512366.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f21b92f6dbcbf4aa7ff743c957af9f4593e2afa74b78e24f1597aff12f87c74. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/USCRB1900144.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5db8e0bc5fd292f6fbd3186aa8287829f8d598e7684a776e8c8a4030d79ca947. Chain 2 (Bitcoin): anchored in block 957747 (2026-07-12T19:35:06Z), 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/USCRB1900145.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ba7a0161d6515b1b280801bc48477cbfb31af99020f0883e658ee1fa4fea768. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T04:10:34Z), 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/USCRB1900147.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3c1825aa6d5d5bf132f6c1b941cf571ee0857d1bd4363c7129b3c8c36b92497. 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/USCRB1900148.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5c8d36bcb444ec26437854e815cbe92df42211e6d044d03b351da259edbf073. Chain 2 (Bitcoin): anchored in block 958996 (2026-07-21T13:11:30Z), 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/USCRB2300015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d5cc0254809658b3d101f34f5f6c182d6c90347e93874b99fac974e549309b8. Chain 2 (Bitcoin): anchored in block 958808 (2026-07-20T02:49:15Z), 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/USCRB2400019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x557b4c99326a685e52e4105ad110c4ab016492a054f13c158a6f1c3de9d6c406. 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/USCRB2400054.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3778b509295819adb2fae906ca78cc9c397da3bab348419153623d0ad9ebb55e. Chain 2 (Bitcoin): anchored in block 958607 (2026-07-18T21:01:11Z), 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/USCRB2400308.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x557b4c99326a685e52e4105ad110c4ab016492a054f13c158a6f1c3de9d6c406. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/USCRB2400054.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc41fe7d57ba1a15a81ded0b483153323e609affeec7e14862059368c85ccf5bd. Chain 2 (Bitcoin): anchored in block 958975 (2026-07-21T08:39:33Z), 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/USCRB2300006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x592fb578befd8aec44e3c477cb0734b238cb66c7f94d2c7cc692cd41bb4462dc. Chain 2 (Bitcoin): anchored in block 958716 (2026-07-19T10:15:55Z), 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/USCRB2200000.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83daac2dea0d5136ae0e38836c16e3ce2414975154d8ffcff7f6b365432f8020. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/USCRB2400307.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3778b509295819adb2fae906ca78cc9c397da3bab348419153623d0ad9ebb55e. Chain 2 (Bitcoin): anchored in block 958561 (2026-07-18T14:22:01Z), 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/USCRB2400308.