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 0xdb0e8432ca87c5d3199f67d533405decc04ef54620c7b6f20bc96001c2c2e601. 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/4c78ff81-ec14-47d5-86d7-d34945476c5e.json and https://artists.proofprofile.net/proofs/artist/4c78ff81-ec14-47d5-86d7-d34945476c5e.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 0x1c6f293230f68bafa101476ea5c670dbbc925d9e507870f7a3b69da2858cdbf3. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/TCAFS2180848.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0cf68d5c5f3ea6e1cd7eecedd3f8f3f26cbc8bb01cfaaf433ea930ddddb50653. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/QZHN32386733.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f0ed0aa48eb53eba549a21aec002af6705395af4be5fd74ca93ef04db2a6360. Chain 2 (Bitcoin): anchored in block 960111 (2026-07-29T13:21:01Z), 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/QZHN92304678.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66c6f83f7b8c8453bb1c35d25dad00eceeb0a3e07906b804e788f46a2af066cd. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QZP7F2100294.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1cd9991c1d6edf0d61a5dd5598380f1260a6100f36538e1cb07f1127222d717e. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/CAWHO2030029.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf6433811a9b3ba68df2218b5506b214cd4b5c42d6749e99112c536de0e354fe. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/QZTB42367190.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc377ec44f4e6a2a404b138170dad8a781b9b3e473ebec92e5e16c96c32ba0c14. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/NO2DY2300100.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf10fe9e4e513597bf98c944cfd0264d07864ecc58ad00d48b0e8d39abf4b2eb3. Chain 2 (Bitcoin): anchored in block 960105 (2026-07-29T12:35:17Z), 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/QZDA62361101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe81a23a72ff8002a6c607693669492e255d1f64c18eed5b667e31e40fa871996. 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/TCAGU2368513.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ba4e50a13e3d2e208a616d2f5960c71586bfc198eeb10656eac6f2b2956a2fe. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/QZTB22278782.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc73cc0d3e0e5697ad2d55ab62c2c5b2201cdd6f2d983f2ead1fff30d0e603785. 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/QZTAW2205033.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb31fb1d13de8daa1ce517f067d213f27f15ae44852f0b1e178389488ed36f061. Chain 2 (Bitcoin): anchored in block 960181 (2026-07-30T00:53:20Z), 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/QZTAT2242250.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7dc6778db2507c9ac0ca13802ba4decbfb62588f85b48f7e3fe13443adc84b46. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/QZNWS2270245.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc4e49f28583c87aeef805f090a1049f4f4d2b200f7265db7240ed2c61f63414. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/TCAFR2119345.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa0ff72ca0d817ebf12bc1bdd8d9c565469c05b4dc0d951b06d026b6351f531e. 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/TCAFO2134197.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf19bb966d0a6b381809a89a87fcb474b4c7dda55be03d98ad5db8f1fea061361. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/TCAFJ2153738.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0061a881a8152887f4f63af65f86562ccbc408098ad6d190a8f24a1d2b214aa0. Chain 2 (Bitcoin): anchored in block 959145 (2026-07-22T15:39:05Z), 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/TCAFE2064788.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb660c3859317273ad2c399227a84661d2d71997790f7475c21742229f025fa7a. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/TCAFD2028918.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x586cca3c94c688c9087f788febe9adcc8f930558fdb1701712d84fb892664b4b. Chain 2 (Bitcoin): anchored in block 960216 (2026-07-30T06:39:12Z), 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/TCAEW2082531.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7178596d37025907f4ec35eccd7d1e114ac37b395d7264196ea1878f3832fff9. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/SEYOK2023719.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e5926cc95b365ba6b3c7b83bf2966d769bfda03549addf08d05f8705f622eea. 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/TCAET2088071.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88a9260afbea61a02352ecb2e77662c00a33de9df91c862c8f70dcdf959e06f2. Chain 2 (Bitcoin): anchored in block 960410 (2026-07-31T13:50:38Z), 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/TCAER2080518.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f7123c09bcb0a097b918a02ddd48aec803c1a8fd881f81b95e02615889e0920. 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/TCAER2028797.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbecaf6a4fe12ef4d2a9370838b96284c0f964c3452371058faa0e5cefc4e13c9. Chain 2 (Bitcoin): anchored in block 957043 (2026-07-07T13:52:39Z), 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/TCAEQ2018616.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0e904dcd76040c461fc46e95d3982269d000dea06c2ed050212321c230d12f0. 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/TCAEP1911563.