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 0xd5cb552d7a064833b82071996b938c6c68f7a501209a3959cd7944e0c4a32f9a. 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/8a22d0e0-3910-4f44-af38-e915a6f320f2.json and https://artists.proofprofile.net/proofs/artist/8a22d0e0-3910-4f44-af38-e915a6f320f2.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 0x12b29d7ac9fc12f0676aab6570788c57dc2780fc2f2fd94fedda5836a3c236ac. Chain 2 (Bitcoin): anchored in block 959087 (2026-07-22T02:05:55Z), 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/USDY41640923.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8a3b59d8037433b473209991991ed4f01fe4ad14242b6a9db8ef85b6d3e9bad. Chain 2 (Bitcoin): anchored in block 958891 (2026-07-20T13:27:11Z), 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/QMAAK1710493.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d294ded8f65d01e9f04f74736e7259615bb6190c1367d6d8b90b4012396c8c1. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T15:22:58Z), 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/QMAAK1710495.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69ea199569100d3229d0d63f0466666ed91d35cb8df9eb690728952402bd8d83. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/USHM91978553.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf3e1b90fd0d5138704a12b9ff0df06f35a520959939d80fdd8fec971caa869b. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/USL4Q2004875.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x782cc73a8e51f04890284c07f0e6d9fe3d55a2cb61cfef1fa89c014e691e6506. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/USX9P2018102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab697e5dfe1c031308338697570cd2c5ae060c2e897e2ffbfdacb6ebcd0e57ef. Chain 2 (Bitcoin): anchored in block 958749 (2026-07-19T15:48:23Z), 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/USL4Q2092325.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ea9b12b5d07a040892561018be8eefb1e85bae83eec1630b700954b9f9f46cf. Chain 2 (Bitcoin): anchored in block 957735 (2026-07-12T17:47:43Z), 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/QZTLA2399007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86f51746d64fb634814d7b1f64332cc1396f8273946079b709c7917c58743e13. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/QZQAY2347799.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda7884827edc63e8098c6a2fa6c16d0c5652f57c52e934746aacfde17f5f4d6d. Chain 2 (Bitcoin): anchored in block 958980 (2026-07-21T07:04:12Z), 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/QZQAY2382143.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ea9b12b5d07a040892561018be8eefb1e85bae83eec1630b700954b9f9f46cf. Chain 2 (Bitcoin): anchored in block 959047 (2026-07-21T19:17:28Z), 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/QZTLA2399007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2bb81d98827aa45a5e50784cea414dabf99fb068e4600d774422290f8cfe672. Chain 2 (Bitcoin): anchored in block 959051 (2026-07-21T19:48:03Z), 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/QZQAY2349181.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01195c7b20a78a3bdbdf2ebe8e8722d52f6fe7074d7d65e6515272fa6f27905f. Chain 2 (Bitcoin): anchored in block 956857 (2026-07-06T01:26:17Z), 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/QZQAY2301078.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86fd28107c29b122e00146c3b27ce7b6e0ff0aba0a380df7c72467339fec5a86. Chain 2 (Bitcoin): anchored in block 958218 (2026-07-16T00:33:33Z), 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/QZQAY2320283.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73a4c3834edd9333fc5b0f89ad5d80e09154dba388fca4036f1985fd3bd08cb2. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/QZK3Q2500003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc8050509c0bb1d0589c0a925387dc7be44aa568438a5732469d3aa556d041e5. 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/QZK3Q2500007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73a4c3834edd9333fc5b0f89ad5d80e09154dba388fca4036f1985fd3bd08cb2. Chain 2 (Bitcoin): anchored in block 958517 (2026-07-18T07:54:29Z), 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/QZK3Q2500003.