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 0xc6bc01db9083556ebe73f793a2bc927f96ef590dae7258dac888a6c45f733b74. Chain 2 (Bitcoin): anchored in block 953754 (2026-06-15T06:45:19Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/af7361cb-8f52-4311-90c7-396aae296c1d.json and https://artists.proofprofile.net/proofs/artist/af7361cb-8f52-4311-90c7-396aae296c1d.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 0x2bcd526f8bcca08893d1d705d911d4e8754f62aaed33954c769b8811cf225641. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/QZFZ72517351.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a1a8099559594c487a84d094e5665495e300f92a73dbefb0eb39bf87c0fb16a. Chain 2 (Bitcoin): anchored in block 957774 (2026-07-12T23:51:20Z), 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/QZDA82592653.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x735e508bf7edbb9788a48e76d6e1c9797ecf7bb555b623606a7a3efd1f47e86c. Chain 2 (Bitcoin): anchored in block 959132 (2026-07-22T13:20:46Z), 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/QZES52539133.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa831445c3b899f89519e7a47da367f3a14d10d100eb714033c8019faf8edb533. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/QZES52531073.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x820a453b23806dc375a0ee78950fe360cdcc8a5cadd864ab5e067d3cf057c5ef. Chain 2 (Bitcoin): anchored in block 957774 (2026-07-12T23:51:20Z), 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/QZES52579205.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46b5a5d605da42a42b4f2c8159b2864ed0ba43b244986cca741d60624e6c48fc. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T08:41:42Z), 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/QZES52559537.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6ce0b1c255974b908ea9e74c67e87a9ba706172a3fd319e40742e80fe88e46c. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/QZES52583603.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20643aca4dc0403e1c8407ccc8d32917fdbf4fc349adf98871c5bcdf81a1d1bd. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/QZES62527445.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5beac25f49dee110895fd3ed1b018c25f2ad79e4870dff03628db50417160d80. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/QZES62543611.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0919671093bcf13853c34a265e3033d78008623356baf1f0362328115bc8406f. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/QZES62560877.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x089fd1987441d0e4824bac1b3706e2645ca94a8b44b74e896c95c5017dd4de52. Chain 2 (Bitcoin): anchored in block 957771 (2026-07-12T23:27:28Z), 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/QZES72578634.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd806934022675bd6c25f8552bbddf8d1bf0721f9a798b67f1cbaf3b99dd30311. Chain 2 (Bitcoin): anchored in block 957770 (2026-07-12T23:17:00Z), 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/QZES72556854.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc12c416f0716aae87017ba55df210a68aebb19c94ff8fd5bea31aad9a9556383. Chain 2 (Bitcoin): anchored in block 957770 (2026-07-12T23:17:00Z), 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/QZES82502948.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9f28a693547e3e5a84e06f89be2d34d855027095738e3e5f4e4ac2bae39faf7. Chain 2 (Bitcoin): anchored in block 957774 (2026-07-12T23:51:20Z), 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/QZES82509724.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68858d53220188e83d3c39503972cf80887f916916d0e514e7458909c56267ee. Chain 2 (Bitcoin): anchored in block 957770 (2026-07-12T23:17:00Z), 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/QZES82528266.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2630c376c2fbee1376f2a68bffcf0e2e47905a7e03c7889b871ba9bd8ba17a7f. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/QZES82556040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9b6df175c5710d0c908ca97cd018866ed48a86c280ad1ef67f6d7a33203d23d. Chain 2 (Bitcoin): anchored in block 957775 (2026-07-13T00:04:23Z), 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/QZES92532774.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6551e10c1038beccb2578ce4fbfcb13dfc1de765c50a4bc3755e755a59f1764. Chain 2 (Bitcoin): anchored in block 957770 (2026-07-12T23:17:00Z), 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/QZHN32523362.