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 0xc36d69f7a691fe8a92c07127fd562b9400ed1a85b2dabedf2b3ffa555c65a791. Chain 2 (Bitcoin): anchored in block 953697 (2026-06-14T21:49:28Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/58799d65-5ef9-4b62-8ba9-7afef71efe40.json and https://artists.proofprofile.net/proofs/artist/58799d65-5ef9-4b62-8ba9-7afef71efe40.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 0xcd30edfbd1c406d85f59f7b52c9957fb3b36d2fb44c24a5ba79c4eede9c59dff. Chain 2 (Bitcoin): anchored in block 958397 (2026-07-17T10:29:45Z), 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/QZWFH2516160.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69d1ab77259666e02f2b8d80ebac924142a850b3aa10a287d49631e612f3cb42. Chain 2 (Bitcoin): anchored in block 956656 (2026-07-04T14:03:39Z), 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/QZWFH2523079.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34035dfe1a33fe195d3885c90eabb214cbba24bbefe8fdaa5338cf0932f9dd24. 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/QZWFH2520368.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d1b6f4ff16a7522bb8de448642bfc600fb64e154d23362107296dc29e6da6b4. Chain 2 (Bitcoin): anchored in block 958473 (2026-07-18T00:52:36Z), 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/QZWFH2516410.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d5d9845f972882b77085f2b192f2b3d464fee7b24775c93d624562720693392. 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/QZWFH2520354.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0ee963a41dab78c4c3a88ecbafc7d33b579aa7d2991f8cf094020b0050e594e. Chain 2 (Bitcoin): anchored in block 958473 (2026-07-18T00:52:36Z), 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/QZWFJ2536227.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e0251e5a1cf8e126d10e7b2508e63d6ae45c896f0a0d82b331c27e86aec9c68. 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/QZWFJ2537966.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x463dcc6b385b3481c514e6e358ecc8de4654ab2704c23a6c0d8d879bbee439de. 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/QZWFJ2532233.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55463e8570f6ce0be79ef2fbe979474afa3f46fda5f3f56b638ce9cc247318c5. 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/QZWFJ2534493.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab6cdab25ba89f61f9121803e59ef5e28b1206fe63aaa37e0fec4558a83d549c. 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/QZWFJ2534488.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9866e13e3d918189536d993a0c290c711763aa929e02ce6cc8e2863b925bd1c. Chain 2 (Bitcoin): anchored in block 958529 (2026-07-18T09:21:41Z), 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/QZWFL2571819.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd8eac61cd25e6418d2b79e1ecc2bcb5509d90fb2f833c8ff052bff55a9d6a49. Chain 2 (Bitcoin): anchored in block 958526 (2026-07-18T09:09:53Z), 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/QZWFL2571817.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x791d0b7de67a393023797f8a609425d73e403d7bd4482cf47d9a368007799e12. Chain 2 (Bitcoin): anchored in block 958538 (2026-07-18T10:30:13Z), 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/QZWFL2568785.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd23ec3fb3e8c18de2a233179630b35a47acb58499b4a9fb13b0ae53fde5679a2. Chain 2 (Bitcoin): anchored in block 958468 (2026-07-18T00:27:51Z), 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/QZWFL2571820.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2013901741ea5365102472a1a8aff602938332b96ca57bdfd19cac50ec2e42e. Chain 2 (Bitcoin): anchored in block 958538 (2026-07-18T10:30:13Z), 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/QZWFL2571834.