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 0x9e486d93c41d8e2ba004518a8e427c8dc6edc0c21f3635b0a122bbac71ed9912. Chain 2 (Bitcoin): anchored in block 953758 (2026-06-15T07:48:25Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/b3727d38-20a2-4838-b1e9-e81b0c1211c6.json and https://artists.proofprofile.net/proofs/artist/b3727d38-20a2-4838-b1e9-e81b0c1211c6.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 0xe300a5f5964666eb35819ea0d8f4eabcd6d19f6fbc574240a28f8f7cbc3d22fb. Chain 2 (Bitcoin): anchored in block 960150 (2026-07-29T21:51:49Z), 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/USHM91757030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf81dcf50da292ef492dc5735aaea94c0d248c80c1120f20d4b8f0933aa712a9d. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/USHM91757032.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x82d3671fa01a81c7e246ad153b88de28ec0dc7d10b39d16f8f1088c2cc9bacbd. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/USHM91757031.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57ad76f3434212e3409d09cd973ffbe8b08aff6048191a29508b4536de966577. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/USHM91757033.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e0558ff50ffb78bcb7aae66ccc0189725131175007f8940ff71840114ac65f2. Chain 2 (Bitcoin): anchored in block 960410 (2026-07-31T13:50:38Z), 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/USHM91757034.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07f7a98998dec489bc2b726f51bb76a5dbb8e2b38f62435f0ea3944e47308f98. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/USHM91757035.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x934273e8ffedf22ea7193cd2733006aa2ed65eaf5e01a1bc2592eb5d177adb94. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/USHM91757036.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb9481e18b36ab6340370c851079b211f0f1756f66b576dd316e1773a3c3272d. Chain 2 (Bitcoin): anchored in block 960337 (2026-07-31T02:51:48Z), 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/USDY42125046.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x365650b2be8ac598515f9d3ec0e062c0dfc1ddd46851f2372e369dc6cd0fff95. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/USCGH2073817.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8e01001a29c45b16647ab76ba479d75117aed2d0634ce5fcba1254e6577d0eb. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/USHM91977779.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5417f3c2c459b4a63745bb6ff9937c5562219822a0ed267b1d53c940abaa875. Chain 2 (Bitcoin): anchored in block 959145 (2026-07-22T15:39:05Z), 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/QM5U51500001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x10a29b11c37720a1f9728963ebe4384de61e0407298374a6e8cfc19364c71008. Chain 2 (Bitcoin): anchored in block 960108 (2026-07-29T13:09:35Z), 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/QM5U51500002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf252ca0c140aae33f0198ad04c1b904634c7f4f793256f9ca50e40a8d85dbde. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/QM5U51500003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19a1fdf448b94ed7318f3a97b6f1e5de300eec93e9ab3bbf3983a6f8c7a48d0d. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/QM5U51500004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd595c7c548fe451479120caffd35b524afa11274523735c22f6fab0de0e48914. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/QM5U51500005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1ad841cadedb8211d21af1a02d1918644e8bdaf2acfdaa16fa85d65f155c7c0. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QM5U51500006.