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 0x3c1c317627fd08ef73b29b32959968fefd1c3a61457d327919ab7c805c6c675e. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/e3305d87-da6d-4a31-b860-bee3690feb49.json and https://artists.proofprofile.net/proofs/artist/e3305d87-da6d-4a31-b860-bee3690feb49.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 0xe96e3e59d65916c81217fc6642e14f84aa1400091c8022240eb73e9440978b05. 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/QZNWY2064436.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9cdb83ba3d29469cb76a108ec61282d035224e1c4257f70bbbf324468215d130. 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/QZNWY2064437.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf732fc42aa52cb277438f6c5c50ff14eac221c24e0f3e0aa89c015172b8975f. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QZNWY2064441.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d38a121c2d530400d6bb38b6939b1cbf8eb9fe4246fcef352917ed1039351e3. Chain 2 (Bitcoin): anchored in block 957872 (2026-07-13T15:39:45Z), 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/QZNWY2064443.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x649cd738a5ef7cc411e0c10d2fd50b01a0b3c2fcd26e0e89c049ba6a4acf58aa. Chain 2 (Bitcoin): anchored in block 958691 (2026-07-19T07:19:31Z), 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/QZNWY2064445.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78c5b7f3188ffc2cd8f35838663e01237b3fb827bfee4e08ebf38c50d3dac39d. 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/QZNWY2064446.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x779d0eeca5be546b69ccefd7853b558bbe9af111af30102c4a9f85524354d750. Chain 2 (Bitcoin): anchored in block 958980 (2026-07-21T07:04:12Z), 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/QZNWY2064447.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc593dd2d1a2644115bd75df9203a897d4d150952989bfc8e5c9349b4fd3629b3. Chain 2 (Bitcoin): anchored in block 958415 (2026-07-17T12:50:13Z), 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/QZNWY2064448.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4c0d2b39af4bc1f7c09df6a370f3d5e2b0b71dec7d26d063100b96c3c3424f6. Chain 2 (Bitcoin): anchored in block 958985 (2026-07-21T08:39:15Z), 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/QZNWY2064449.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c218e67c9c6a6bd2485b4bda016d8f32f422d60dff758e50ce00292a51357d2. 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/QZNWY2064450.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d926e64d2c8a55fecde0916db155ad65ea6d5fd64d2d00f17a4e24dae30ea56. Chain 2 (Bitcoin): anchored in block 958690 (2026-07-19T07:14:39Z), 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/QZNWY2064451.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b69bf9f28414011a077c6a6c7f90dcada616eff83df294406cc5d9b7a0939de. 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/QZNWY2064452.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16fbebfde3fabb7ba4ce274714f0f2b21a87e647b9c3e45d1a36a17a14d5a396. Chain 2 (Bitcoin): anchored in block 959058 (2026-07-21T21:09:36Z), 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/QZNWY2064453.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa95cd308f5782088652a2dd6179845118de3d265b90ad678d9dec73d839855d0. Chain 2 (Bitcoin): anchored in block 958985 (2026-07-21T08:39:15Z), 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/QZNWY2064457.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5575a9ba406f27e845dcce6408c8d2c004086582429df74a5fb3c45ec0f803f1. Chain 2 (Bitcoin): anchored in block 958322 (2026-07-16T20:44:14Z), 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/QZK6J2111219.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7af72714d0b014dbdb91e519d425e47d5da138384a8200ea53de53a022358974. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/QZPLR2199751.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b7f85232b2f07e370c2567d417673a880ccce9c5cb88d9fc1de9d02f4b22d1b. Chain 2 (Bitcoin): anchored in block 958218 (2026-07-16T00:33:33Z), 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/QZTAW2258966.