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 0x1fe07a417ba41c0be8013e2c450a24eebef6b663e7592f6310c0aef9a8ac9a5d. 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/6175f698-2f37-4983-8b4d-a41892a59ec1.json and https://artists.proofprofile.net/proofs/artist/6175f698-2f37-4983-8b4d-a41892a59ec1.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 0x6041329920d98f10e7613f6ac832769505b1a0fe3f69eebef8ef97e53cac811f. 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/QZNWU2061177.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd77ab81f4458815d2943c92b83397e02a7f52ba46c302c5ba4ab5f4484ae1e24. 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/DGA052446255.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf86b29df43eef1a227b30ca920c663e4ee0b508d421c3c6b73de4c867e3527e8. 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/QZHNA2127529.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa51a10ae7e3c4fc73fae7609ff56a6a6a848a660e58ac95627d7bd8f5f34282f. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/QZHNA2127524.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdae7a09fe19e95895a5970db1ea20b76bf0d6c6dab6220965fc8dc0f3ea0d048. 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/QZHNA2127530.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x776b6d6bdf52ee61a966e759207624b6ed717f88a96fce0d0e14c8b0743c0f06. 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/DGA052446253.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1edf0f9f73178450da45e74a24775abe04dc2964b8947ee221fe97522011ea2b. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/DGA052446256.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b81f9b1d6868ecfa3e9b3524a5a97b73d129768a8087bf171e11db9d677aa4e. 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/QZHNA2127527.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x867bfbaaa724bead53778463c7846c7b3325ff99b82ffb7ea4dc707b9092dc8a. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/FRX452390744.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa16e936e4654341cfd9854064e80e90f9f4624d5e91241bec3ac5a7a56a09de8. 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/FRX452390745.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c64615e187faf89f43f7f7e2dcd4e2064d4748bc004ea74a4255e3f0db0826c. 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/FRX452390746.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc806f0f909e0bbb24c169e713c428f70767b635b7ff52c9dd9b263491bb606ce. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/QZHNC2023717.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcfbf22c7d2a494b895107bb7dab8a38e63673f396eddd8393fcf8b79c56a5174. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/TCAFT2191599.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x175759def0d2570ed9b88cc3ddf7a7fd60704b8397673661d3df4f81d9b48305. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/TCAFT2191610.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfbf88a7e698b8f45dadc4aa11ccdb8acffe1134c1d8450130768e5945d514345. Chain 2 (Bitcoin): anchored in block 960427 (2026-07-31T15:59:18Z), 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/TCAFT2191629.