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 0xa785534e0b0ea0c3ccb274f4841f4d99b6ab4568f0dc52f4936197985e289356. Chain 2 (Bitcoin): anchored in block 953807 (2026-06-15T16:39:18Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/f0ffbfae-b1ed-4bc6-8888-eea586c89f2c.json and https://artists.proofprofile.net/proofs/artist/f0ffbfae-b1ed-4bc6-8888-eea586c89f2c.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 0x0eb67d5fc86b4dad61694eafad2cbf75dbfefe3841fe9b38b98fa26080d72d42. Chain 2 (Bitcoin): anchored in block 958573 (2026-07-18T15:49:54Z), 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/QZHN32034113.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4aaa059f484cf6239741078a44116b17e68ccd67f0372399938d45c54fd70d6a. Chain 2 (Bitcoin): anchored in block 958800 (2026-07-20T00:52:19Z), 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/QZHN42028119.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a836fe2fdffb601f05851d81a51bec683061e6a26a71b5803f32c68c79a16e3. Chain 2 (Bitcoin): anchored in block 958985 (2026-07-21T08:39:15Z), 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/QZHN32034130.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3353f4a3625f5d98e84557ae2b779939776ee4cbfee0c0944b90ffd314fe5e8. 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/QZHN32034136.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a2224625a3fb0363ceb6d936281dc1cc80303421516a216c44a541916025b20. Chain 2 (Bitcoin): anchored in block 956578 (2026-07-04T02:23:20Z), 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/QZHN32034116.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5d0eea606c81d55bbf64f07d2ce77aa635f721b2f3ea5f02db392246ec5b354. 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/QZMEQ2050190.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07b691c934a7053d0af173b54584f89652ba1b847af745cc44ed740385355199. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QZHN32034127.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0021d43051dabc44cb2e7ab482d3951dc48c0d23ac492cf63ad4ac0ef0d648b. Chain 2 (Bitcoin): anchored in block 958621 (2026-07-18T22:59:44Z), 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/QZHN32034111.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b13182944115690f02d4247825e3f7b1e1a44a5394b7f47b94f2fc3876eb16a. 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/QZNWX2044865.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae507e3222a653c88767eb9c6301f6032cb8cb23fedbfbbef8e5d348dca4d82e. Chain 2 (Bitcoin): anchored in block 958276 (2026-07-16T10:20:17Z), 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/QZMEQ2121171.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c98e73662029c56d97bc70624319beede022b7b8dc8229b139cc36363058a34. Chain 2 (Bitcoin): anchored in block 958176 (2026-07-15T17:14:36Z), 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/QZFZ32242650.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1334f2ec2834c25ff3e7ce4171179c9cc6d79d6f734fac2532b1d4fa735a57cf. 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/QZDA72216568.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1750aab59878f3f7e65055ced4a03cc67275ec9d905d43ac763a2b331f240f41. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/QZK6G2241818.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x224f1126f8a39be70c1c6b524b28676c91cc7c268f732f3b27758d4e542adc6a. 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/QZES52450170.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc64189b7752480b24a334ed2df418e70bd4583080ec039d2545b6533e05c2432. Chain 2 (Bitcoin): anchored in block 958095 (2026-07-15T04:30:08Z), 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/QZTB42388711.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8f5e02c0acde626ae310ed065be8e7573b60aca1c2ecce63c2b021951828ea7. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/QZNWZ2456744.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6604c71c579158fbb9a6c0588b47165a3802aa3806f207c921b1e13d378ea375. 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/QZTBD2419199.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6125f0a95537ed9931343ffa0f7a6dd36049579da857e1a4b51d39551a96aa64. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QZTAU2534824.