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 0x63515fb83d46944ad85219b64a80c0d9f04036fa0a3837d4ebe1215dfd17fa93. Chain 2 (Bitcoin): anchored in block 954130 (2026-06-17T19:07:14Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/7c07741c-3d67-4763-a297-8f02341c1128.json and https://artists.proofprofile.net/proofs/artist/7c07741c-3d67-4763-a297-8f02341c1128.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 0x42b751e0905e55068dc5ac1690599743c9fafed0ba45ae2a646ed345093b7311. Chain 2 (Bitcoin): anchored in block 956728 (2026-07-05T01:43:49Z), 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/TCAJH2571112.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0f73cf93e22ed177fa627eca2d7f7b1b8e553793a96bf48d250f94aae582aaa. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/TCAJH2571116.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8fd007347fe464f940839586e786604e45c2e7d836f9d4fc3b30384ea6b34428. Chain 2 (Bitcoin): anchored in block 958563 (2026-07-18T14:29:03Z), 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/TCAJI2528578.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99eddaf8b4d715c30790ff9e7f38fad88a1be9bd393b233c58102bd07851a1a6. Chain 2 (Bitcoin): anchored in block 958621 (2026-07-18T22:59:44Z), 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/TCAJI2528587.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39bbd9675992edadcd2733bdcd12000f4131c293e189d813b6e46ae49c6aa6af. 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/TCAJI2528594.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b6f2f2385d155c837cbf6b2484d85a3982804eea403c76007bedac9c2888b02. 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/TCAJK2553931.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7dca673b273826192010d44e4433381246a93727c66dff7915659ff86abee7ff. Chain 2 (Bitcoin): anchored in block 958792 (2026-07-19T22:55:52Z), 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/TCAJK2553936.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xedc464dea8680a9d07d2f4e18a8d43d321a1a84508259034f8b4e9218896eeaa. 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/TCAJK2553946.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x880bf3ea98621cf328fcda6e0e1701fb43d111c7d9d9b7019d0d43a6bca92064. Chain 2 (Bitcoin): anchored in block 958734 (2026-07-19T12:54:58Z), 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/TCAJK2553950.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1efe7fe7e1c475326ce358334441ccca991b1d28486e77ca6e68ebd694a94e37. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/TCAJP2547564.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeefc71e4ffea2fa4e062eef25359edf3d9a08de149fe473c1cb94bb2faac6c35. Chain 2 (Bitcoin): anchored in block 958377 (2026-07-17T06:48:00Z), 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/TCAJP2547677.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea2f9c98bbbe6af81ccdb2517b0693df4c636df933be5e741a5d70b6cc9784e8. Chain 2 (Bitcoin): anchored in block 958428 (2026-07-17T15:15:14Z), 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/TCAJQ2547680.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67576370c71cb73d105e1a73e3ec27449d3fbd256c118b3c3cc1b0a253cf28ce. Chain 2 (Bitcoin): anchored in block 958331 (2026-07-16T21:55:37Z), 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/TCAJQ2547683.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2b84863c83bd6e1237f6e99aa9d86687e119c8b7ebb93b8f1515aba496d896a. Chain 2 (Bitcoin): anchored in block 958263 (2026-07-16T08:19:47Z), 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/TCAJP2547687.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xedd872ecea5c99f41cf7141949421add8a33c7dd28165eda4089c40f7341f2a3. Chain 2 (Bitcoin): anchored in block 958331 (2026-07-16T21:55:37Z), 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/TCAJP2547691.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa47a5fbe1d7e1c448ba9026cb1c6b9e285af72c44aca6334ab83922c65ba6b5a. Chain 2 (Bitcoin): anchored in block 958805 (2026-07-20T02:22:58Z), 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/QT65Y2537335.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfce1d987b56fa5160e4066dfc2cfa0d1b03909b6a207de112d79ade13de44655. 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/QT65Y2537342.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2c6c0cf52a422758bcba81d91f75290fed37bd2359ca903c69c0ff075adf88e. 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/QT65Y2537350.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8825e51e8a18d244cf794c0f7269f73a51fa658353771d6adec7e16e652feba. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/QT65Z2566910.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8fc45cab53119862c502ccde8e92f873c0169589d938f1d34b243d9b14237376. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/QT65Z2566915.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4e27021a8048d4bee5068ed5258afb3ab7661e4fd6765d8bd4aa3fd289420c7. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/QT65Z2566919.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x874233e68d0c7d3a75dc12aed03e5f04f00e7c4d5d661cc560e7ada990e154df. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/QT65Z2566981.