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 0xbc0be66c86b03ed0728c81cc40c5a8c46eb0a8c260caad42ba58f33ca85efe11. Chain 2 (Bitcoin): anchored in block 953746 (2026-06-15T05:25:34Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/a679fbe2-6c4b-4c35-bd42-dad9cb260e2b.json and https://artists.proofprofile.net/proofs/artist/a679fbe2-6c4b-4c35-bd42-dad9cb260e2b.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 0xd161a0fc73d97e796f3c8167faf2cca1ced512381c58e187728da3102c1ec7c2. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/IELCW2200002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x869a540f15149080ee3680283c6ee162a3557972a63d34e04f40ee82efcf988a. 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/IELCW2200004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8557dadd7a85bbcd555af57d6c37f9ae22fd31899c1e2e03523b67c957ba25f0. 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/IELCW2200005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x286dd4aadab3c36f4cd590cbc8c29dc34373ec3b7cf339fa8277d155b4121bb7. 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/IELCW1900001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x10e028697445c0c6c548fe5c5d7c5957e737f7caa11701a639fcf8c9f885f15f. 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/IELCW1800001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc268112787fdeff384840ea8951113c4886576b45cc95633283f2ec1b3c456d8. 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/IELCW1800004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe732382f7d1ae67b770e4f72729f03ba13533f441c7c786369581e93bcbdf7c0. Chain 2 (Bitcoin): anchored in block 960370 (2026-07-31T08:38:45Z), 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/QZ9JZ1784455.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x129d4b302fe135d208fa45f576bd419463c23a0ca8a2a4dce62d9af636c948d4. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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/QZ9JZ1784457.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5658ccc3955c039500c1b76961a0fb45f504cde0a5e47a6de37e8623f4eb25ba. 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/QZ9JZ1784458.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d57abc30ae1361de17d3ee58d2a1b97afacd8938d4d4c4697bf2fa7d7c25cec. 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/IELCW1600008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71bbac8e39dc88319e3260c151d5e676779e64212e79fd6cdafbd53c16f2b0cb. 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/IELCW2300002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6dca924fff69cebfbae75a906262b65bffa46938989e970243d2df8483d8892f. 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/IELCW2300003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4ac82117b2bdf843a10fae0815875a035ce003b8e87ab1c260714db136566e6. Chain 2 (Bitcoin): anchored in block 960314 (2026-07-30T21:00:46Z), 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/IELCW2300004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8dcac0477058d8e6d14562c6f49fc257a2a5b48fd71c4248933a1de2d7b78ba. 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/IELCW2300006.