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 0xd7f34d65206a73a9b77975fbffe6ec7374e57cd51c8801a3a1cc1070f2e1055f. Chain 2 (Bitcoin): anchored in block 953808 (2026-06-15T16:45:15Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/f183d9b5-bd8f-476d-9664-0b0e8cd4c4ca.json and https://artists.proofprofile.net/proofs/artist/f183d9b5-bd8f-476d-9664-0b0e8cd4c4ca.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 0x604aaec6c29431a272e656229d7890c4df31c125891ae5e2135331c34bf0c6cd. 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/QZMER2478650.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0dd1dc1e0bab0559f30e2fef23ee3a2558cffe53bcccaef71b26fbbb2151fcf. 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/QZNWR2413455.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76a8852b71c1bc5c4ab53a4fdfa673534d03014a5609a8d006a0d687805465fc. Chain 2 (Bitcoin): anchored in block 958238 (2026-07-16T04:30:31Z), 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/QZMER2454824.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22eceacea8ae723c80e0e3ca73f05a5f0da354c7c3fe72d77ad6dda80f2b7515. 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/QZNWS2400021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe706cc0238aa567cf0fac186c1e7a6f7f6afa1eab4e9e84ef226f0fe9e0d0e37. 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/QZNWS2493529.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed5ae1e6a06f400501cba305e24d588209494c9d26b28d8190bfb0e979015579. 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/QZMER2409449.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb01efba8126297242e251c56ce506c1ded88c50a8a67fb17865746caf56f7c7. Chain 2 (Bitcoin): anchored in block 958202 (2026-07-15T21:23:21Z), 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/QZNWQ2401592.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62a38d6ad813f873bcf1ff4cd3283f32e95ce5b0a8c4ed25147d0d28c974d14f. Chain 2 (Bitcoin): anchored in block 958180 (2026-07-15T17:59:52Z), 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/QZNWR2448010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15ea44c1f4e0b15ae611649ae1d6a8260f16ae347f42eb90124ede818569b7ae. 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/QZNWS2498498.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97e774bf68f932987fc93d2fd5ad5a3be366e915c4906d706fd55f655895e23c. Chain 2 (Bitcoin): anchored in block 958238 (2026-07-16T04:30:31Z), 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/QZNWT2415153.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5216c9af0e7bc6d34a1081e7de0cb2baa5d88aeb48df799479dcbf8056885e02. Chain 2 (Bitcoin): anchored in block 958228 (2026-07-16T02:46:47Z), 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/QZMER2431857.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb66b14ab7ec3d7b50766bb5e20f4ed104943ef20ecad48d5fe5f4b5cfe4f876f. 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/QZMER2434734.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90b87c7ea5103df123901cf810b261624c6209ef1dc62a81de7256c42f7a4981. Chain 2 (Bitcoin): anchored in block 958234 (2026-07-16T03:46:09Z), 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/QZNWS2458571.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42f30a7b028f7a7f252dd2b7095c3992a092d1d8bcf10983c668b45aa1a109ca. 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/QZNWS2485397.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ab82e432d12cf99c25558f7d05d6667f544a52505d2a884de60bdb4cefb9adc. Chain 2 (Bitcoin): anchored in block 958180 (2026-07-15T17:59:52Z), 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/QZNWT2405764.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6557bdee83217cde3f4d844ac4558dce0ffc36d71a0b5263e7e3635258301ae5. Chain 2 (Bitcoin): anchored in block 958238 (2026-07-16T04:30:31Z), 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/QZTPX2439911.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56f6eba30ab43d3c5ad6deb96727b994a5dac9f9f16c6347723cd0a41129ed4c. Chain 2 (Bitcoin): anchored in block 958180 (2026-07-15T17:59:52Z), 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/QZTPX2439913.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54fc4b0b3234131462a3ead06bf4319c06132e247c26b261b03a3696787b8c1d. 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/QZTPX2439917.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89322b3f5f314deab5c74a5525a2c0bc51a1261cc8578a7b0d8c1c3893b7d38c. Chain 2 (Bitcoin): anchored in block 958180 (2026-07-15T17:59:52Z), 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/QZTPX2439919.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6721a44c693e534ff99fa6658bf46dff170fbb658d465837f0c7cfe6d6dd46a0. 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/QZTPX2439921.