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 0xb7bac5cfd3229ceb0c58edd910ffbaa17ec52290ca932dc660e691c8958054f8. Chain 2 (Bitcoin): anchored in block 953626 (2026-06-14T11:41:45Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/2134fe8d-24b3-40b1-a4f3-370336d90f07.json and https://artists.proofprofile.net/proofs/artist/2134fe8d-24b3-40b1-a4f3-370336d90f07.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 0x46e3cdf0c9f4c8d78f82172abcccca5d4634a9baa8e44fe4091a38d7132a71ab. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/QZMEQ2507745.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd088874de6fd628be4fac43917d91fce05cf3743e96d8adbb7916950a98748ec. 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/QZMEQ2507746.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ba3a75dfcd6f797b9f15743d3a13fc1446bdac1e25fd019f8db35a07d431473. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/QZMEQ2507747.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8021c779ad278035a3dafe782da80f938fa24965b640da55e25740e058f2111f. Chain 2 (Bitcoin): anchored in block 958420 (2026-07-17T13:33:01Z), 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/QZMEQ2507748.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x151cd819597e22213d891b1039545e41d47f66e67ce851abbde8d48503463fe5. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/QZMEQ2507749.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52d110933e752abd26687931e3588f62dff5ecfdd1461382d9c9b1f9038b73b3. 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/QZMEQ2507750.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf04dc4ca8c6fed57e0a180abab002528322ab05a6dd0441da2163ad4510d8b4c. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/QZMEQ2507751.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f0408a833560c6bcf043e69c21543f42fac5a9172c890dbd4a7274644aee665. Chain 2 (Bitcoin): anchored in block 958371 (2026-07-17T05:45:43Z), 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/QZMEQ2507752.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4a38656ad45e440941adfb7ed1efee27b1c32d1aaa8a8bdc913eb81f40fe672. Chain 2 (Bitcoin): anchored in block 958377 (2026-07-17T06:48:00Z), 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/QZMEQ2507753.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45431e13e27c3a6a30af83e35d5e3e1b7a7095137a4cf4232bba729b16e27f8a. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/QZMEQ2507754.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe17adf6491bb4cbc392389e586d7cdc6c969718adefa473e78ca386a11dbc23f. Chain 2 (Bitcoin): anchored in block 958432 (2026-07-17T15:43:17Z), 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/QZMEQ2507755.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c1856e4fa6615f2836dc9883b2c3900cc238f14637d3acb72e219a3a6baa49d. Chain 2 (Bitcoin): anchored in block 958430 (2026-07-17T15:33:28Z), 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/QZMEQ2507756.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76a15a0b7250f3fb27c06360c038555e002f7be176631b67a5dfb11eb212e609. Chain 2 (Bitcoin): anchored in block 958238 (2026-07-16T04:30:31Z), 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/QZMEQ2507757.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff26c64be04d83cdaec0f254879b8ef2fd6dca4e3480bf90b7ffcb5159c22a5e. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/QZMEQ2507758.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x638a93b80a02cb012b2efab9aadff4242013bbd7fc75b2ecb6a467ff5abccc24. Chain 2 (Bitcoin): anchored in block 958377 (2026-07-17T06:48:00Z), 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/QZMEQ2507759.