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 0xfa7dbcf78237d3df8588a7124bddf43e2b572b0f0ff33668d0540a008730cb6d. 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/a42b82c4-df7c-462e-9aa3-339335d041dc.json and https://artists.proofprofile.net/proofs/artist/a42b82c4-df7c-462e-9aa3-339335d041dc.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 0xab03ae2f53818ac2b5e6c2d97224b32d32eca64c366460b38c335624b3223e6c. 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/QZHZ42189432.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04c89d6fb4952eae943250cc16ecb0847ac7eb7f14ae8a72834a8ce7b70d44f8. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/QZHZ42189428.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee71f38f824be427eab217099ba4cf2efc24c108d34424236eb9c342700d1867. 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/QZHZ42189429.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f08cdc04decb38187c72cbe19ef519663333a06b02ee7536ba9a2daafb7754b. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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/QZHZ42189433.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2fcd2701f24d1f149fd839726583d5d00df5bbbde0afbbdd56c1970fae7705db. 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/QZHZ42189430.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1a1269b8cea87d245c5aefa07e3b780a08f7c184d416a7577b5d3ca21d51853. 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/QZHZ42189426.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9da33cd430652c49fdc1b2339de69624472d1ae8559f0022e274be834d13fefc. 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/QZHZ42189434.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea67e7d56f12ced2c96e7a06e4c4a78d6a59625427e6e860b7572ff4cf27e769. Chain 2 (Bitcoin): anchored in block 959107 (2026-07-22T07:19:23Z), 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/QZHZ42189435.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64581cc0456022cf3ead475c744c010da6e1590e4644cbee97ef9383bd471862. Chain 2 (Bitcoin): anchored in block 960199 (2026-07-30T02:30:29Z), 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/QZHZ42189431.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed7df275aede5b37090ff85e4149fe6827644639409f253966906ad5b7722e99. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/QZHZ42189427.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a8315a8db36f8583ab50e828714e8de0c9615a56a3b51158d90393d96cff184. 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/QZHZ42288719.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf590f1e9381fc349346b7dd63da16862727f70ee395f5dc5336369fdad4b63aa. Chain 2 (Bitcoin): anchored in block 956482 (2026-07-03T10:33:57Z), 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/QZHZ62257296.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbfe0dda6c3db92f0fb60e70d0a7ca2d2d7537e7920638537bb975d67c7aa7701. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/QZTVM2220845.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc16a84efe54b96de436fe74632db90c4e45311c4348db6033344c2be8eecf75f. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/QZHZ42293745.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79282f690fbc3f3db2559c4267db85e482813117e3f63ba64cfa232b72654b5d. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/QZNJX2328098.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd5b4974d1fb2286968a8761e1641d6951be5a017b3d3da38b852344f83e4471. Chain 2 (Bitcoin): anchored in block 960160 (2026-07-29T22:48:59Z), 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/QZNJZ2326506.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f02fcb973113175c09117e930c8e18ff0a94ccad6c33604e12b086ff77a1044. Chain 2 (Bitcoin): anchored in block 958857 (2026-07-20T09:45:25Z), 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/GBRKQ2474057.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23a8743ee758dfecc63bd02daa258c9220c5983a1fccc4fe4d6ef92c31c77f52. Chain 2 (Bitcoin): anchored in block 958842 (2026-07-20T07:48:27Z), 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/QZZ8A2416374.