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 0x604589d45b57fe431e859cf473f9ed2e91934939c0f55596b8702409b5c85574. Chain 2 (Bitcoin): anchored in block 953697 (2026-06-14T21:49:28Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/73e84e06-0cfd-42c7-b2c9-eb20152ee4c2.json and https://artists.proofprofile.net/proofs/artist/73e84e06-0cfd-42c7-b2c9-eb20152ee4c2.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 0x13317ab7ac5ba49eb1353df2b9fff9f66646f0a46a68dec356af9f43bcddc5ff. Chain 2 (Bitcoin): anchored in block 958880 (2026-07-20T12:33:53Z), 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/QT3EY2540092.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbba765e27da833468d52d343bcdad5dfbb6a28287803ed18d5b24d6ee935f10d. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QT3EX2596314.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x379be13f95c5410255da79dbdb63a26ce940860bed2cb8d21295cc67b633f763. 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/QT3EY2539812.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab64c9eceb8ef543e74d38a923d0b5ad8817f48ee8df278251d1720ad8ac0db3. Chain 2 (Bitcoin): anchored in block 958897 (2026-07-20T14:57:46Z), 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/QT3EY2540095.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6362ce6c62f0e4f815d3aa8edfe30cd5db72476036b62728828795cd8c5ec73. 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/QT3EY2556672.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6fcd887a97b6f976981e2bc1df3664cf273bdad551f4e38bf8c050f579fc997. Chain 2 (Bitcoin): anchored in block 958897 (2026-07-20T14:57:46Z), 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/QT3EY2539939.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa53299f2bd84f3a7012ab54d685f09b4ad7217ad013592abb06a761612d9d289. Chain 2 (Bitcoin): anchored in block 958816 (2026-07-20T03:51:05Z), 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/QT3EY2540208.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02aa8e3db09bbd3689c2a77767d09e1685df83168371dcb8792e8418cd447ff6. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QT3EY2537269.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf351c32fff07f252f0e31c32e21908be87187ca79920d3bb3060caf33c222ca5. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QT3EY2540625.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d95bd3fee89160809ca2283b6153e4aae6744b6c811d9bc88a696ba807515d1. Chain 2 (Bitcoin): anchored in block 958864 (2026-07-20T10:24:04Z), 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/QT3EY2539815.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd4f860918cfc99880f710c3cb4c7d95e4a03a549fe1bcb8e7ff5b719b924d85. 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/QT3EZ2579695.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac4a65efaa8fe7398f26feb0a953d1b848ec351b1cee8c0a8e1843eb40d946ae. Chain 2 (Bitcoin): anchored in block 958805 (2026-07-20T02:22:58Z), 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/QT3EY2556663.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5c431428b51e398fe790dcad3bfe47930e6cb8830464ffcb0d68427fc3c8e96. Chain 2 (Bitcoin): anchored in block 958857 (2026-07-20T09:45:25Z), 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/QT3EY2543223.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab83058043b6e977a7fef544976963dd3eda5d26d65c3d8ccffb1acb5c69c835. Chain 2 (Bitcoin): anchored in block 958885 (2026-07-20T13:01:04Z), 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/QT3EY2540538.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40de987ee0af76c2386b8ce9fb1ea0abaca8b4624cda5bbf5467f73f89e30905. Chain 2 (Bitcoin): anchored in block 958924 (2026-07-20T18:54:07Z), 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/QT3EY2556676.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x012a86774fb07664ef6f953d1fce6726de4c86e6016c96750f6ee9a99c15ed44. 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/QT3EY2556657.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb10dd48797357cca4938ca04bf47f9d8c8667fe5c606dc9a7b8012574b031c58. Chain 2 (Bitcoin): anchored in block 958819 (2026-07-20T04:08:24Z), 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/QT3EY2554744.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0d993391437e04acf3c7786876e1e0be74d733723072608ecc7754c82d50f43. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QT3EY2534054.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3287e09f34919816fc0eb4bacbea5055050129bfcb54609c170490f31af4207. Chain 2 (Bitcoin): anchored in block 958864 (2026-07-20T10:24:04Z), 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/QT3EY2558848.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ab04171de729d8c5a9ae3900d3da95ae4c0db6995b84d5e30d5f462bf46b03f. 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/QT3EY2540347.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdeff94f6625a3aed65363c8ebac173d6c53583d47976a72bafe3fb6fcf828a29. Chain 2 (Bitcoin): anchored in block 958857 (2026-07-20T09:45:25Z), 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/QT3EY2540535.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7f6cace0e0ee60a3750a388798cde1e2f3529e5f57170d91d91127d65416f4b. Chain 2 (Bitcoin): anchored in block 958857 (2026-07-20T09:45:25Z), 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/QT3EY2543149.