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 0x306f8b50e56513cafa89a0e3247618a5cf764aeb0d15e32845ef3ba84b99746c. Chain 2 (Bitcoin): anchored in block 954065 (2026-06-17T08:10:43Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/522756d6-5eaf-4e3d-a949-7d8ea27f6af6.json and https://artists.proofprofile.net/proofs/artist/522756d6-5eaf-4e3d-a949-7d8ea27f6af6.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 0x2bf6d65a551381d6975f419dc418a4d53581f997760cf8d6af868896b875512c. 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/AUGBT2406800.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85fae48981ac5cfd22b0b9273760ed03f65d6ead8f8ac3606b2f725169a083a3. 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/AUGBT2401824.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb94dae13ede9e89eac1acb6abc88aaf5dec15f4889d22b587641345cc86d0a0f. 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/AUEVY2300011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x128a7b2e688d946d66e9e63b185793220d74578f6885e52dad0cae4d4c5c20b5. Chain 2 (Bitcoin): anchored in block 960509 (2026-08-01T04:30:37Z), 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/AUMEV2536065.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45d3c929bc6dda23c4a37377e359f83f5aa3c67f4a774444f9fd36933aa24e49. Chain 2 (Bitcoin): anchored in block 960506 (2026-08-01T03:50:58Z), 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/AUMEV2432450.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a8aaa9aecd6d1b05cd9b0836fd03b715298825d4d3b12a3904db1184b3b0c9a. 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/QZFYY2582312.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6855b9ba6a0d1a9f341935a38fa87788bdd78c13e6c9a626a74ce8d059a54105. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), 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/QZFYZ2511245.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdeb12fe04e987202543f04bf786b5e2e59cc1141d525ec80b8f62fc1f10b1a73. 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/QZFYY2580959.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ed9d6cdfd32071cae9ed69c9e7068d2f8e1fb8da02dad37cc10ef0ce5c9680b. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/QZFYZ2511246.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3063e356e84973d9eea05dba9c1f5533c02bf986357ffa4a8777f23b22d6c068. Chain 2 (Bitcoin): anchored in block 960229 (2026-07-30T08:30:10Z), 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/QZFYZ2511247.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ed197c5d3888d0cca5b535e198658dd07938d89fd56e1894058b64361e16e66. Chain 2 (Bitcoin): anchored in block 960095 (2026-07-29T11:07:37Z), 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/QZFYY2584176.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6feac269b5f993be985368727052175a4fef6e2f77a780636530bf44f0dc61b8. 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/QZFYZ2511248.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x154f8a2c4b08fa091cb74ed686fd101a4cedcb3b949bee9843413a3fc77f58de. Chain 2 (Bitcoin): anchored in block 959134 (2026-07-22T13:34:27Z), 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/QZFYY2583370.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a7afb5792577d8e3649771610f092eee13cf8e70a20944955d52e24476f3a84. Chain 2 (Bitcoin): anchored in block 960183 (2026-07-30T01:10:20Z), 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/QZFYZ2511249.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07d6c729573538fe046354efc784fdd081092cc5903ae2ec0f023ef779feec33. 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/QZFYZ2511250.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a8a35050b1ef0407dc97590711c6e4ee525296c80072951c1779c8c0dd6c44e. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/QZFYZ2511251.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa207f4451ca0a1a1834d10d3473960e52614cab60fbae60fc4c1afa96f81c69c. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/QZFYZ2511252.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc76cf2e7bb16ad29a3bbbce56fa0e3ac44b3d2225f55fb1c4e9d8f431e8275a0. Chain 2 (Bitcoin): anchored in block 960113 (2026-07-29T13:38:16Z), 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/QZFYZ2511253.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1591793483420a7abdf391c2897fffecc097e8c8c91aa7e7fc271de3012f6ac. Chain 2 (Bitcoin): anchored in block 960164 (2026-07-29T23:23:05Z), 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/QZFYZ2511254.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc144f8ab31b9c89546fec8766d9394b693dea11dbeaccbcfcb99bd9c3a3ca33c. Chain 2 (Bitcoin): anchored in block 959132 (2026-07-22T13:20:46Z), 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/QZFYY2584178.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7515b2d8bc57846025d4c1c0eb3fb266738c5ec714122a4eb0e6ee1c6c308120. 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/QZFYZ2511255.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x452c00e2cbd593873575b7c16e6d499e4a35788caf9da0a6b98f8de7c07d7a3a. Chain 2 (Bitcoin): anchored in block 960209 (2026-07-30T05:15:54Z), 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/QZFYZ2511256.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61b3cbaf537ff21d62d2ce265c19df8716fe051977c75fb1d9ed0038b811e776. Chain 2 (Bitcoin): anchored in block 960362 (2026-07-31T06:58:00Z), 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/QZK6H2470143.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7247853b69cd3648c31c5a1659fcf1c45ddfe6b55cf98e0ca11ba2ca062119d2. 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/AUGBT2342863.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d9e38b43ef99a95f3534669a0dfa94308fe1376d5be9c61528387047adaf839. Chain 2 (Bitcoin): anchored in block 960497 (2026-08-01T02:22:04Z), 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/QZHN62565981.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa04a34512b7f01dae62a8c357e3f3d2327fb9f76fecb85e039fa67b1e6a55137. 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/QZFZ22503045.