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 0x7c3d0b72087d112d436572ac05678aed2087d1f576db584f04296e268e3592c5. Chain 2 (Bitcoin): anchored in block 953674 (2026-06-14T19:07:16Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/5f2752a7-3bc7-4693-a31d-2d393ef85a6e.json and https://artists.proofprofile.net/proofs/artist/5f2752a7-3bc7-4693-a31d-2d393ef85a6e.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 0xd6d4dad7911568cdd55df228d9a405b0b2db2a357e15a825ab2d30f9c7411f57. 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/QZRP52167151.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa97eff9752f0af3a7b1b30205c7ac6fb465ed3cdb55b1a97806c7d8499bbadbc. 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/QZES51807265.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62c752c8ee8ffabe41354e99ab09b50c3e594974cb261aae83e3e02cac12659e. Chain 2 (Bitcoin): anchored in block 960121 (2026-07-29T15:22:21Z), 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/QZES51807266.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c3f76f78e4c78abb599f3eee583d8721ccb2ee8c489d369cb89ab2b6ead20e4. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/QZES51807267.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8dfcadb31e69e1eadaf2675eb1be5a498357fb1c10f58d507cce573b0f5b0abe. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/QZES51807268.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56dc16dc11d87b3e08d401c9f7431f7ed1d412f18637c385a582e0d49ac677ac. Chain 2 (Bitcoin): anchored in block 960220 (2026-07-30T07:28:30Z), 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/QZES51807269.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa91abeee12e8dfc349b7dcb222cb98fe5fb615cc7dc7bce79523e90d28abfe0. Chain 2 (Bitcoin): anchored in block 960459 (2026-07-31T20:22:46Z), 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/QZES51807270.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x731c7e023e7cf20f1155745a0db00c30800225fe25bb915fba444cba264d0ccc. 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/QZES51807272.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75384f331bdfdfb2a04dc5bcf684d8bfa6f09383bcdd314d52c7db6934659339. Chain 2 (Bitcoin): anchored in block 960463 (2026-07-31T20:42:35Z), 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/QZES51807279.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2e3ce26c34cbe6cae835383f55a9b102074af2c111fddb3da954306826f3b7a. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/QZES51807280.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb92e4c646443f3b63aa1d9ee565327bbeb115a13b9de94c77c5d53524f4c235e. 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/QZES51807285.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c9ca87c11e49c5ab8a1992c4f674964919c808d8fa1e2e5c164fe0e2be10492. 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/QZES51807286.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b7e2628845c77eecc55ea3abb0fa89414c4e0c902bdbca7fda3c0175b65428a. 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/QZES51807287.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e77b0199f7053085f90bfd7fadddd128103548185e30adc1ec31fa75080ba9f. 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/QZES51807288.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x539e4368bf88434e67dd4362c444af04b46f0cfe626a8a4a123d5ba5e504b390. 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/QZDA71878315.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87f0c462d300100f4df71ac50343cf6e3859b897748632eb0d54719cc4e478e8. 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/QZDA71879548.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca6f5d9ea0b901255c5bae1fee14642845a8041ab67428de88c05767e67bb880. Chain 2 (Bitcoin): anchored in block 960485 (2026-08-01T00:10:46Z), 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/QZDA71880952.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe45e430d0bea3c69751de6771d589db07d9eb051ab1822768ad95a1f6047c32f. Chain 2 (Bitcoin): anchored in block 960497 (2026-08-01T02:22:04Z), 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/QZDA71880955.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4a25cc96431f51c89ecbb5353e79efa2f7dca63f65d0b7e8760e458f36ba58a. Chain 2 (Bitcoin): anchored in block 960497 (2026-08-01T02:22:04Z), 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/QZDA71880959.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3694e2e2f5cf6a3815f363f975baa93ff9fc596f6a25f768f82bb42f1be6446b. 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/QZDA71880968.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb81e6bb5b774d73aee8e78f3ef4a40d1e265bbc28ad9286017e0ded6b6d0e445. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/QZDA71881535.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba9ed3067078257749ab2303603527c95f7f6ebc29b78adbe0fbfb4985bc0106. Chain 2 (Bitcoin): anchored in block 960509 (2026-08-01T04:30:37Z), 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/QZHNB2081882.