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 0x0908e83a62f5821fee20282f8928e9c8b889e1521cb88652f87bb3e1821d64c5. 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/52c4fa6b-5fbe-4350-8f67-948d05bc11b8.json and https://artists.proofprofile.net/proofs/artist/52c4fa6b-5fbe-4350-8f67-948d05bc11b8.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 0xdd8a59e5f85a211a931e8230c666676454968c6b13340c78fb6798abcc2b209c. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T17:30:29Z), 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/QZES51974987.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf68e7042623d7523f8cab1107504f830f9a42385b2ce83e14032ee26479040e. Chain 2 (Bitcoin): anchored in block 957880 (2026-07-13T16:39:18Z), 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/ESA012085846.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x746e3e50d9c851337f962a706a8c7fa511fd463ebc9000462748fee5b44b8962. Chain 2 (Bitcoin): anchored in block 958783 (2026-07-20T00:08:32Z), 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/QZFYZ2097217.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3092d534ff2df3677c96abb777d879d76e3eb6733e8c14df11845909d012e7cf. Chain 2 (Bitcoin): anchored in block 958714 (2026-07-19T09:51:44Z), 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/QZK6P2115628.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8d880223cbff4bf450d25e062d596d6173d397329f0fd36de9aafb6138750b5. Chain 2 (Bitcoin): anchored in block 959058 (2026-07-21T23:22:23Z), 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/AUMEV2292904.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b8d73b0a62eb8c3a37995d5865b34e032885fa8da9939ef80077d6db2b99026. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/AUMEV2230120.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x814077b2d69b90a1e31752b409290ea7e328eea04668b45b5641debfe7d1b8b7. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T08:10:04Z), 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/QZN882303231.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x118ce7a654c177a731b72355d089536d72fc1a814ce097e91d18a9ec190ab340. Chain 2 (Bitcoin): anchored in block 956476 (2026-07-03T09:04:44Z), 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/QZFZ42473885.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7cb21237a6313004a5904259c6720a8e2af8c1a700b1cd2a1b7218439443b46d. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/QZHNA2463734.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x546e027135a277d3ce7c442bcb02c731d7e23b9a70384260df40d1131c824cac. Chain 2 (Bitcoin): anchored in block 958185 (2026-07-15T18:19:04Z), 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/QZNWS2462697.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16b804c049ec37730fa688d25efb55d03c8b5beb5ec5d01da5f49b817343cba7. Chain 2 (Bitcoin): anchored in block 957805 (2026-07-13T04:34:37Z), 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/QZTAW2433092.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x118ce7a654c177a731b72355d089536d72fc1a814ce097e91d18a9ec190ab340. 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/QZFZ42473885.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9af12fe290b9bd6ca53b34d4b0740ebb6d01068752726c423a7f541a2f7eeaa. 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/QZTB42556724.