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 0x16b26620e303f7d23ee6628812076e57da2bae470f99cca87c0a0ac300dbc616. Chain 2 (Bitcoin): anchored in block 954593 (2026-06-20T19:46:01Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/be1d6c40-4f48-43b1-88be-b1e6deaab2ed.json and https://artists.proofprofile.net/proofs/artist/be1d6c40-4f48-43b1-88be-b1e6deaab2ed.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 0x29bfc3f60f6822b220654d83ce4206aada84c960d292942d20b5b9ccbbd36163. Chain 2 (Bitcoin): anchored in block 960125 (2026-07-29T15:38:18Z), 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/QZRP42349790.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ccbb1e48a86a15d6b396cb0cef8910289dbc13cd0af30d331cf4b915a411bf2. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/QZRP42349791.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc400e0fe9820345426b24a6444f5ab71126a0ceef12331ecd7670dc77ec6e4c8. Chain 2 (Bitcoin): anchored in block 960435 (2026-07-31T16:33:26Z), 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/QZRP42349792.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd988ad84439537aae82875860609db3af4e115c7e0fad6b7285c38943c9fd2b1. 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/QZRP42349793.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0eb6f0df9bdb0c8065b51dec29ab735d36d93e0f2ab323a69dd03e1ea4816498. Chain 2 (Bitcoin): anchored in block 960427 (2026-07-31T15:59:18Z), 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/QZRP42349794.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb3111755194240bf8ab3b69f567209ffaca1478c8ce808eb563117531d175ae. 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/QZRP42349795.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc08a9023e519b9e0f08039c12fa3240e4fd38a19dd58f7626d766eed5ebca392. 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/QZRP42349796.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xecad4465aad223781ab73b7285f163c379382367159a435cc3b59d3a22df9e0f. Chain 2 (Bitcoin): anchored in block 960302 (2026-07-30T20:09:33Z), 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/QZPLS2320103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff31d4bbfbf75817510c9f4b81a30f25dfaeb191688b70347ceba899b49409fa. 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/QZRP42349798.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3f40a5651ad2f54d32594000dea3d5be39bba3baf854f840e8748227e911343. Chain 2 (Bitcoin): anchored in block 960487 (2026-08-01T00:15:43Z), 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/QZRP42349799.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x816813c3724591db28dd3f7058c2d16697af24ae1828b5b94d28ee101b44a617. 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/QZRP42349801.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf786f71558f922ced929e2873ee82de7b186e10bc0e23f2f838db3146ee446ce. 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/QZHN52073566.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdff6b0c4272b0e5b1a6ba8a6a0fede2e88798fc4aae25a63ca882b59daae7fb5. 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/QZHN52073567.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b063fd4fbfd0de3e51eda0bc548d31e5e98b818e05adbff50c13b1087896453. 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/QZDA42035685.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfddd4592b98bbbde6459cb42a3ca294c801dea7f2133afa3e86436c6c676833a. 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/QZES82025558.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac69ead811140118a67aebcfebcb3b2d81cdb06f0021368e852479a7e9d46b4b. 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/QZHN52073568.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19f834287ba0ee206dc6cf52825e2387383155f2694855524fb733ec3c997de3. 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/QZDA62036426.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0894acbcb626c2bf4d232f9d0f2c6f1d0aca4f7e2317a50c16b1dcfd809ea0ca. Chain 2 (Bitcoin): anchored in block 960513 (2026-08-01T04:52:22Z), 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/QZES52078619.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06d48469b15551e906df9e75caa10dcae2752a51067c38b657a759b577fa16fb. 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/QZDA52024675.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0c115e727591014e10dce4bddfcffc795b2171d6f49ec1f466eb541746164fb. Chain 2 (Bitcoin): anchored in block 960220 (2026-07-30T07:28:30Z), 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/QZHN52073571.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xccf323888077c0754821702b934bed13a9d7091e69b47da50158ea5638e0dfe7. 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/TCAEG1951136.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95cc132510a2ef094c79e7bca6318f3e8e00db7bafc35554b6515693dffdacdf. 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/TCAEG1951137.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5dd020ac04e9f07775b021eb2d433eb5f14429804c117675f800a4585042b57. Chain 2 (Bitcoin): anchored in block 960429 (2026-07-31T16:07:24Z), 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/TCAEG1951139.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xccd392146df526f92c8605db91fbcb132d0808637b4ff304699a96244aa44874. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/TCAEG1951140.