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 0xc4a6fa90fcf36cbadc84f2d7dc720e5cf1c82290d671e50bf62a287886be9cc0. 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/ad6873b4-ffc4-414d-9141-15148fcca00b.json and https://artists.proofprofile.net/proofs/artist/ad6873b4-ffc4-414d-9141-15148fcca00b.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 0x84d76cc75c3b485a2c062a37988b48f36d2d910210d278ee822292e084c90850. Chain 2 (Bitcoin): anchored in block 958087 (2026-07-15T02:56:49Z), 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/QZTLA2575536.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd65c3b7145ccc9e4fc7ab801e27ed786bfa6123563bed68005ccd0cbe256fe0. Chain 2 (Bitcoin): anchored in block 958153 (2026-07-15T12:03:04Z), 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/QZTLA2506392.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x220a7a1630406fdd8107c8ed718091cd6435fd57542cb51714e787c7e1011392. Chain 2 (Bitcoin): anchored in block 958180 (2026-07-15T17:59:52Z), 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/QZTLA2585367.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf72f39555e01c5f7e864dfbbd65d6338be252c7e89730dce08b529ba597dc95c. Chain 2 (Bitcoin): anchored in block 957766 (2026-07-12T22:25:04Z), 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/QZTLA2558792.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x064656dac605e5e0adc45998b34c69bb0a74eef3bcef77e3c7652b843bc95fe4. Chain 2 (Bitcoin): anchored in block 958091 (2026-07-15T03:17:03Z), 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/QZTLA2583433.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff846937cb80ee56ef9fd9d2af0ea750003e8925a2d8137040b46399b52b8e22. Chain 2 (Bitcoin): anchored in block 958176 (2026-07-15T17:14:36Z), 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/QZTLA2514995.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a908cefc01cda7b9363f72b1d427cd3c5db71747eaf7259ba5c735fbdc35d9b. Chain 2 (Bitcoin): anchored in block 958234 (2026-07-16T03:46:09Z), 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/QZTLA2517755.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb78376c0d267153742e24236703bcc0d47534b74047906bf682709fb27feff25. 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/QZTLA2577067.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02284277ae80e97c6bf193f8990711f2c314393de2ffb0b4967f4091783c69e6. Chain 2 (Bitcoin): anchored in block 958170 (2026-07-15T16:21:50Z), 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/QZTLA2501950.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf20e241d0b5fa5f0ea5dfdb4b468404fb88d927fcb090c20b2f0d5fa6f62a3a3. Chain 2 (Bitcoin): anchored in block 958176 (2026-07-15T17:14:36Z), 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/QZTLA2578803.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9113679f19768beddffcfddd4fc5b80a86255a0368861814476b88958f28f561. 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/QZTLA2529566.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb332ea698eef7f8201b2946169bbae383fb475462be00a505e26b255db6b883b. 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/QZTLA2576527.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d0eb89e9a15625362a2d5e46b1518e0535f67440d6484c4a7b3c05b5689c27e. Chain 2 (Bitcoin): anchored in block 957766 (2026-07-12T22:25:04Z), 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/QZTLA2509222.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2483f1246a1c7fc8ec3e5299c60e6b2261cbcdb31382d5b08f90cedd4786471b. 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/QZTLA2564496.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd4ac76566f81baab99955966d617fe99d49bd89f9f3b01111b98fac631915bc. Chain 2 (Bitcoin): anchored in block 958846 (2026-07-20T08:14:15Z), 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/QT62U2526761.