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 0x80208fbee58176dc1bc77f0a7039ec83a5d8d2a5b0b70c2fcaa71c4953f2fa6e. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/078600eb-20aa-406a-bfa1-4c511e5f771a.json and https://artists.proofprofile.net/proofs/artist/078600eb-20aa-406a-bfa1-4c511e5f771a.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 0xe239830b3c801b4521c74520eb05045b579aad2e76ad72076a12ef2cadcddb49. 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/HKG732261776.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb771c8a5e6149c8e5be9aa196319b2eb4ce14d0cfd92755e8bff9e5000dcd477. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/HKG732219926.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbba2feb5fb8e56be607e96e66d886a61fae8c4dc9be9ec9721d2877eb0cb72ae. 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/HKG732028348.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6dc7ca63b849cf153159f8a2ec8a3bbfdc63c86cb8d13ce58f373603ccadbe2. 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/HKG732261782.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa39a87cf91ad5b862eff6f32a786e3543d208a373b1de28e3ddc560fe32e0353. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/CNZ632400029.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x305537591e910463a07b9fec0713da86d769b01edd0499719dad5f7e1c58c577. Chain 2 (Bitcoin): anchored in block 959145 (2026-07-22T15:39:05Z), 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/CNZ632400030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23dfe16ae80c06ca12765f4bd34cae0e873091056845ff79200514d3dc289334. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/HKG732203447.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5fe5cebb67469b01b3a2375eac068fa47ff5fc3372a444b1f11778f52d2a5c2. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/HKG732139825.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3e21daa68de3033177fc06e1e3e9ac0f324870a8a19b4a56c6fb45eef6f0128. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/HKG732128122.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x580fd0b8483f1dba42c358506b0f88bad4af8eedb219475fc50a688b2c3309c3. 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/HKG732314117.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x516b5a2670160ff26a8f015c6b3e75fd7d5df4f0922562c567ee17b517d380ec. 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/HKG732159588.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b8274d81b8fc1c7d14a3e0dbd5fdc717a56a5ffcf334a1a88d638d61b1a3e1c. 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/HKG732340893.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c4910a2dc781940e1ce127cc2b02dd2bf7231677685b06c48410d2c94d76b7a. 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/HKG732233307.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5735e75f2a58f18813a73a415992d15e769b409ced9d4e56667e9404255cc954. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/HKG732233308.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44f526e2d01bde6256a393ad646f29681c97cd613edca25c21f5d6e675b18bd4. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/HKG732229694.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8cb2044faac10344b8949a06a2f53d5460670fc4cfe0b9035ba42a8ba93c8a8c. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/DGA0R2319508.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19a3c9765b23c1ec082ba91899fdb60bd42701396d5a1556225f4675eba058e4. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/FRX452338906.