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 0xec4907fbe2e5f59731ec7fa033d54b515bee4d6864e1e95508c23a0e2cee91f5. 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/4f620d6f-1275-426d-9a8e-0143f79af141.json and https://artists.proofprofile.net/proofs/artist/4f620d6f-1275-426d-9a8e-0143f79af141.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 0xa36d5cc5e2d740f61048e2f79c6c19c7b5767dc948f1de871c75d189d46ff3bd. Chain 2 (Bitcoin): anchored in block 956440 (2026-07-03T04:03:57Z), 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/CAFXT1800001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x899f698e6a3451c22cdbfd38151f50a7c938fc81e3830496d58db993bc986d61. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/CAFXT1800002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0623bb1043de9c1425f3f1e3f8188e373d7e3cbfcc4f17ec176e60a2f309f2d2. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/CAFXT1800004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0c415880650cee0efad1aa1e6c4677d1fd9167370b790058df3fab104dfd8fb. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/CAFXT1800005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1777e356bb52e0fa07126105a7f2211ed5974317ea902e81ab09cb03f9f29601. 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/CAFXT1800007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x811c56d46513e18b9d4f2a1281b75a1eb0052833a6d374df0f3f355a2d2e5843. 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/CAFXT1800008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe208556055e0988f392973231d00b700e5ff4d4ad0bba6018845b762df2a2078. Chain 2 (Bitcoin): anchored in block 958216 (2026-07-16T00:00:34Z), 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/TCAEA1987355.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e14ad7fac345cd3413047d541599ae81a5962c9b3b1608be00516d88f6c2dcc. Chain 2 (Bitcoin): anchored in block 957711 (2026-07-12T13:56:57Z), 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/TCAEP1902952.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c5dbca123806294b728db131b52ce78b420506ed392dd96a308d535ac8aed5c. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/TCAHP2305340.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11d2e45cff318676733147e24b079b79fbc1c1bec06b6e27bcd98b26dfe69aff. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/TCAHP2305343.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7350697460310599ccf87d11527f5db23b801179bb12bceab89b78b1d768a783. Chain 2 (Bitcoin): anchored in block 957620 (2026-07-11T22:32:56Z), 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/TCAHP2305352.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88f5d1ed297ad89ad887d71b8105ec0e820f340edb0776baa6558b788d6b0186. Chain 2 (Bitcoin): anchored in block 958476 (2026-07-18T01:26:56Z), 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/TCAHP2305356.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e5af990475a3c8601eb15e8e42070cd9f9618a6aa993bffdb427dfef9a053b5. Chain 2 (Bitcoin): anchored in block 957603 (2026-07-11T20:26:17Z), 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/TCAHP2305359.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5c026598f637e651b5f39946969cc2279a1498fc0fa3e12b2f0070b4a32002c. Chain 2 (Bitcoin): anchored in block 958541 (2026-07-18T11:37:54Z), 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/TCAHP2305362.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc0f52c0e6253553387305bca55a07c8e1aa50e13fee6d5297529798f5418df2. Chain 2 (Bitcoin): anchored in block 958798 (2026-07-20T00:05:41Z), 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/TCAHP2305365.