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 0x0463a57837ebc756c877feba34f977834fec04d5d68b79e512e748fa1c2b5df3. Chain 2 (Bitcoin): anchored in block 953770 (2026-06-15T09:50:11Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/c18c95e1-68a6-4c23-a3c8-452c7c228468.json and https://artists.proofprofile.net/proofs/artist/c18c95e1-68a6-4c23-a3c8-452c7c228468.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 0x734044e39635698961aab421c8203ff61649b3ea54fafd633cd10d337893aa26. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QZNWY2447194.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0fb75471f16362797bda0da01ecb7c926e6c11ce777dc8b79b334d1db5305ca. Chain 2 (Bitcoin): anchored in block 958924 (2026-07-20T18:54:07Z), 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/QZTB32472882.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56f2ee7729b7c63b2d02ebff1536e871d30d9e0729fdd17d93174033caf4e6aa. Chain 2 (Bitcoin): anchored in block 959132 (2026-07-22T13:20:46Z), 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/QZTB32472883.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdca4c5aeb948dc3cfab8780b8bb5ef13864e7086049d8de28e855696f13ba880. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/QZTB32472884.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28fc47e1a6b600506cdecbb3ea8c3792977fa4c0281bd8f9e221a8d2f63f0bea. 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/QZTB32472885.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5fd16394f92e970fb16d568eee1c5bb1b5fdd5f45713523e6ca0b53f5b0492f8. Chain 2 (Bitcoin): anchored in block 958959 (2026-07-21T03:51:22Z), 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/QZTB32472886.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6f73943faad8cd86fa2f4f0447f5bae499d20284465278e1e2af6708ab4888f. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/QZTB32472887.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39897275cc121d4d31ecef7f3c616eb02fe77deb92b11c105a8ad06df59f4dc5. 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/QZTB32472888.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb55f5eba65ee996b212c6f4a7e355d4e17ddced9155ac1fedfa7bcee865a001. Chain 2 (Bitcoin): anchored in block 958746 (2026-07-19T15:36:35Z), 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/QZTB32472889.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd98257fc07de9c7b512635152bc9d343a55f083386e9a8ecd185206c4d08b32. Chain 2 (Bitcoin): anchored in block 958746 (2026-07-19T15:36:35Z), 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/QZTB32472890.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7699cdfe8c75342e165340fa8cf4f99f5fda0117ac4b185af926ff8b37c2f6d6. Chain 2 (Bitcoin): anchored in block 958742 (2026-07-19T14:09:34Z), 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/QZTB32472891.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x759a3a706cde96c5d0443548dfba4d1bed875ed3fc95fb2921fb0f566b2f4c88. Chain 2 (Bitcoin): anchored in block 958756 (2026-07-19T16:12:29Z), 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/QZTB32472892.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47c31d22d086d32960db3b4464c3ca4d60d6396170a4b70cc7e9a9324b3fae8d. Chain 2 (Bitcoin): anchored in block 958793 (2026-07-19T22:59:45Z), 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/QZTB32472893.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0af89e012e26bc5c61ac660f48d0af5861382cc37e5f2430d56745340c772be7. Chain 2 (Bitcoin): anchored in block 959008 (2026-07-21T13:14:05Z), 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/QZTB32472894.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b59de1132b1e65886e4aff70b079c9adaa2559e3c79d82c913e1bac1f55102a. 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/QZTB32472895.