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 0x773ff68bd524e7b48ad8b2a25010318051745ba677be2a6a6888e6aacee01dea. Chain 2 (Bitcoin): anchored in block 953707 (2026-06-14T23:22:21Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/7d2c5544-12df-48ac-a8b0-670868e53e04.json and https://artists.proofprofile.net/proofs/artist/7d2c5544-12df-48ac-a8b0-670868e53e04.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 0xf5367604426441b6224343ced0b6c5ee20f3b5b50e456c3d9ca0c493aaa5a9ff. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/QZMER2332425.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x091659df92bb47384f0c71eb87e6be5ff4f563ad6a5847272b91630f8d34e70a. 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/QZWFP2329553.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44a12c6ea46d6e4b77e8abf590f67d38b81711f65e9f051e722a8e704217bdff. 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/QZZ7S2464001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xecd84170c76010197b3f6e6e9667c14106d8874af1cbbddc05be188452e4e811. Chain 2 (Bitcoin): anchored in block 960459 (2026-07-31T20:22:46Z), 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/QZZ7S2464003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25a014060ba6da41c7fcdb9a8c4ea129d7d45a66e28f08bd720aae53d322eb03. 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/QZZ7S2464005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a6435cd2d7e2349ddbc2f0de274a1ea386ed43e826ea7b3db09cb40e82fed6f. 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/QZHN42517395.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18c4e9308542a2c4830956760379ad7c5e9a7a07d34302cbeee1d3c158700763. Chain 2 (Bitcoin): anchored in block 960203 (2026-07-30T03:35:13Z), 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/QZHN42517396.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68a0642ea3f5511af376dc16185ab13e69b1736d4adaa0b220970dc8a62bbd81. Chain 2 (Bitcoin): anchored in block 957061 (2026-07-07T16:07:00Z), 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/QZHN42517397.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbfffdd4da456b6962110bba6e91837932b3ccb6997f814af58a911201c7e5075. Chain 2 (Bitcoin): anchored in block 957061 (2026-07-07T16:07:00Z), 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/QZHN42517398.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa242130aee820bb588a72a2194d3f9efc99ae8eb69fe2ff5a698d2e7fef6ac8a. Chain 2 (Bitcoin): anchored in block 960250 (2026-07-30T11:13:28Z), 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/QZHN42517399.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x94ffdb1c7640fce64bdba45b2a33c782a1c07a390d70cd99db450b596cf150ef. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/QZHN42517400.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f91398497f4aa0eb8dc58f93945e26688a22ff10e7a321c2a8c0b961c137bbf. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/QZHN42517401.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf01bb09d0fa4c144990dce13e25aca4607b02941d7e618ed705a347085987240. Chain 2 (Bitcoin): anchored in block 957052 (2026-07-07T14:50:41Z), 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/QZZ7X2425717.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb2c503892336e763fe42ab7a4194c23cd07e36b256e5f9a9c10bd806448eacf. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/QZZ7X2425718.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb857f78a9e68f5531c858c448d91fa50d0ff71ee732836dd05383c5d0740f03e. 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/QZZ7X2425719.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d71c50938344e3d024f165d47a8663782fb0a979787d6b9725ac474934f3301. 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/QZZ7X2425720.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72006cfc35c7355c9dd82ea149578d356fa3a36c0a7d76f20251a29b00bbc4bb. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/QZZ7X2425721.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xada21baae98360e0d8b07900905edfdcaac843824ff6d36a634c77955d93d4dd. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/QZZ7X2425722.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7c18d806c5db7dffe54a259bdcf390a4348b1176e59c42eeee0f9a376a9cb55. Chain 2 (Bitcoin): anchored in block 960218 (2026-07-30T06:57:05Z), 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/QZZ7X2425723.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe927baceec98d308237002d1183524fbdd031050cf8b425e9c5e707521f664ad. 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/QZZ7X2425724.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e55214b9b068032aef20f2ea8b7e3fefe4e328bc4462cdfb23fc889f25bc44e. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/USX9P2482800.