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 0xe2d270209d38e414e834b0796c93eff9094c4d9761cd20a1185089ea395b30f1. 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/6290714b-c78a-49ae-a851-5aa48b1853f8.json and https://artists.proofprofile.net/proofs/artist/6290714b-c78a-49ae-a851-5aa48b1853f8.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 0x842202dfd0b10f1208177eeae4965ed2ed4cbff6467e6e0d0e2a51168bc22384. Chain 2 (Bitcoin): anchored in block 958110 (2026-07-15T06:57:12Z), 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/USTME1850083.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45a7e84c40c0e9de87d53d991d908bdcf044b4bcea920cbd42f6d4ebb7ae8dd6. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/USTME1850085.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0feb1e804e0a36d8d907824df3de204e99f2f488dc17e1a10fd232dcb911504. 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/USTME1850086.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6131144eb75c1216990de5fdd557dabc4f13b394298aa12b003a248622782501. Chain 2 (Bitcoin): anchored in block 958146 (2026-07-15T10:33:22Z), 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/USTME1850087.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b3a055aa9bbc98b3bee57d94236729b72e4192fd6feb4a12de55ccad2fdc29f. 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/USTME1850088.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x382b49ca9b0d718b06fc5935fa449a5adab0963e6ebeaf3613f429d5a5251a41. Chain 2 (Bitcoin): anchored in block 957569 (2026-07-11T12:44:25Z), 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/USTME1850089.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c8089cfc44e9a7a1786f392d648a29477120452aa958fb2b5a4a72f2f6aca5c. Chain 2 (Bitcoin): anchored in block 958673 (2026-07-19T05:38:28Z), 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/USFVZ1990229.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3326c619099ca9e643431d820cc6c8344c63da46535ab5e1746e772b6b11dc43. 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/USFVZ1990232.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4318c1b2c97cd30fcb0e4d593819386ffd9f1da9f6e1f741cdacc4a778dbf5d4. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/USFVZ1990233.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31f353a1bfe808b4fc19452103c014861bb8a19fe652a51d8dc5243ae122cced. 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/USFVZ1990234.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4729ee75a446d67d0d081477023a8efdc4f89660714f611ff121b6301859ca4b. 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/USFVZ1990235.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a19fee58f431be46e12079a803cb1e9331dee9900e4368f1fc51c9c47560b5e. 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/USFVZ2290841.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba64c05d20bb89255d1d7fbeb0ae07ee370e764c7c959a73444a80db5cf00628. 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/USFVZ2290842.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c7c212d8612d2084b1165a0bb368ec10e734f1e006d1ff830431e1b0b269932. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/USFVZ2290843.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7bc37c71bc4be8ac08bdff66df17c115bc8fcea33e0e67755d0812a85b4be19. Chain 2 (Bitcoin): anchored in block 958594 (2026-07-18T18:05:01Z), 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/USFVZ2290846.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c5f975e1d2caf77faab4f06068f1e1ca10fe6ffc1192c411e8a622b04ec2532. Chain 2 (Bitcoin): anchored in block 958212 (2026-07-15T23:25:50Z), 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/USFVZ2290847.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2eeb44ef28c8cdca552cfd39ad4eda06041d4913003dd80c5a8f7b6647483ba0. Chain 2 (Bitcoin): anchored in block 959107 (2026-07-22T07:19:23Z), 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/USFVZ2290848.