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 0x1fd45ee282c9b7bd4b2078c76cd93d6ed4e579463a4a7188c1320d002b4f49dd. 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/c9cc6283-3426-4617-a0c5-04622e67cc0b.json and https://artists.proofprofile.net/proofs/artist/c9cc6283-3426-4617-a0c5-04622e67cc0b.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 0xdf3347a40e35e169bd4021eb4fe3fed90d74acf4a8586a35d4baf5a1e116fd7e. Chain 2 (Bitcoin): anchored in block 958051 (2026-07-14T19:14:42Z), 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/QZDA62204693.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb26a33cafcd64d8882227b5e1e45c643718e0e63d83b0f31d260f33e27735cc1. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QZFZ62265803.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf55f07328f1cd0e3900270b7a7fb3e0aec4d834b44ec12646056a7ac9f61f3f3. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/QZK6G2218225.
Yawa Lembewu (For Late Mzukisi Sibukwana)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ec6e34c63a7137bc082edb35ac122b5a3f558d2b76c9e612f4f2706ea48a398. Chain 2 (Bitcoin): anchored in block 958547 (2026-07-18T12:44:05Z), 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/QZMEQ2468132.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5662964fc00b34d26f73d902bc7f60a940dbf37d92fb9749cbd77af898da496c. Chain 2 (Bitcoin): anchored in block 959058 (2026-07-21T23:07:31Z), 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/QZWFT2478607.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf81ad02bd5c24208101157d7af8b3ffa6fa851a6bc70dbc4ad950cc08a352ed. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/QZWFT2478608.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d1ba5eb8e0bd2ae8676d0580a4910d5d86d677a8c84d4d93396c2e32a6d568d. Chain 2 (Bitcoin): anchored in block 958476 (2026-07-18T01:26:56Z), 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/QZWFT2478609.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe394a2cd7c580df828d3612fef16d8df433cbc987f8810d8f421045a744f6e6c. Chain 2 (Bitcoin): anchored in block 958673 (2026-07-19T05:38:28Z), 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/QZWFT2478610.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ac3f8e96c1c82271de9afbdbe22da21ee5811e91661c4ae6953f7db6460ef18. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/QZWFT2478611.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1ec7f123b12a2b374aca1e9cfd268e3c121212acc90d5267611dfe165c4945b. Chain 2 (Bitcoin): anchored in block 959096 (2026-07-22T06:44:07Z), 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/QZZ7P2466950.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0e8620fbafacc0301a7b79b1cb17c83b19328f1dfbde2e24053d5c07992823d. Chain 2 (Bitcoin): anchored in block 958468 (2026-07-18T00:27:51Z), 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/QZES72555196.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a99879d3153235a2ceddc183e414227788a6ff87894056a9dff6e8c3033ad97. Chain 2 (Bitcoin): anchored in block 957872 (2026-07-13T15:39:45Z), 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/QZHN52514989.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x425e0f04c883caf8bc8eebe6eb6b239bd65b2e98e2d0cc6b5fda0aa07da5b413. Chain 2 (Bitcoin): anchored in block 958568 (2026-07-18T15:23:47Z), 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/QZK6L2554141.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30daf14d99e90672e25d545c9f20ec48901fd7c1dd5b1a6f326a0880d583552a. Chain 2 (Bitcoin): anchored in block 957745 (2026-07-12T19:20:20Z), 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/QZK6L2554142.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c72f1837e9c3cacafada46be98f6de6315388fe285228d95f94b9f203ccb0ee. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QT3F22542887.