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 0xe6932f4d81fab6ffcde624780af6059e768c231e5274bb4769deb90f3704853d. 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/c1c56f26-bb82-4e4a-954d-a49df1ef532e.json and https://artists.proofprofile.net/proofs/artist/c1c56f26-bb82-4e4a-954d-a49df1ef532e.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 0x06739246c73972c0d6aded6db6a3ea57db54519f7496da56abd487127e3271de. Chain 2 (Bitcoin): anchored in block 958256 (2026-07-16T07:22:18Z), 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/QZDA42291916.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15f2bce41edaf2eb1ee90a3ce26ab4525f6ed25c8c3a59f5e2328d9f0a312824. 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/QZES62230580.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x666f7188cc5a5b201884ae4474a7626f7dad5ea2b2d402e0a096519e2dabac58. Chain 2 (Bitcoin): anchored in block 958245 (2026-07-16T05:50:22Z), 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/QZNWS2279734.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81f83c52a04b684c6634b5fc76fc6d076a39f54bafcb1d0a0584ef48c28e8a53. Chain 2 (Bitcoin): anchored in block 958541 (2026-07-18T11:37:54Z), 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/QZNWS2279737.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa901ca2ad0a3540b4235fa9e3bf10bee916380ae491ba886d58303b604d719c1. Chain 2 (Bitcoin): anchored in block 959061 (2026-07-21T21:34:21Z), 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/QZNWS2279738.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a821eff89bb92fd54d4e5e2a2011be5a04094135da99e2d60e52e44f4b24997. Chain 2 (Bitcoin): anchored in block 958256 (2026-07-16T07:22:18Z), 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/QZNWS2279739.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4b7a0739a9db0b22fabcc2d1d5694bd8de8fccf9661d5be8988a560852b8b62. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/QZNWS2279740.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49d3b24bffafbf580dcb4fd9eaf5126a71f6c810692e2544367c3f51f0008e2f. Chain 2 (Bitcoin): anchored in block 958696 (2026-07-19T07:45:31Z), 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/QZTB72212956.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d6fcb00cf8f9cd16c75ce46d47335d2294921b6cb9ab9a802d80d2324e8b79d. 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/QZMEP2372555.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c43ca28acbd0f9f6b820dd03a95378afcec843072e647f346c4f1a958c36148. Chain 2 (Bitcoin): anchored in block 957709 (2026-07-12T13:52:43Z), 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/QZWFE2489411.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb655bdc5bb15e92efb36ef918a724418a02f86c3e6df66105c6920bacf1b59aa. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/QZMEQ2539577.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c351d2dd5f5f28a16f75d068845df989cb6c035887f8f80d0800f0843f42b30. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QZMER2544663.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2fa1b806efd36eabdf3bf400647e43512425cc44c06dfeb3572a301d214b0831. Chain 2 (Bitcoin): anchored in block 958366 (2026-07-17T04:59:09Z), 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/QZMEQ2539579.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac3daa40494c5a1720213f7d7a37c005f19808d3deff9a433b2dc5a6a8ddbfae. Chain 2 (Bitcoin): anchored in block 956745 (2026-07-05T05:33:35Z), 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/QZMEQ2539580.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa64593e3af3db16ea24f09269a313b74c11302a55f5dd9b9960d796a27deccc. Chain 2 (Bitcoin): anchored in block 958579 (2026-07-18T16:26:17Z), 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/QZMEQ2539581.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d91ff0436f310ad0f7d332e1c4658c4092dda86a58ed731d71f1b43027089f8. Chain 2 (Bitcoin): anchored in block 958436 (2026-07-17T16:42:22Z), 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/QZMEQ2539582.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e1e77edbe27e200e37d3d44b969a0931a64e1fa113f68d60410b5b63347555a. Chain 2 (Bitcoin): anchored in block 958585 (2026-07-18T17:05:16Z), 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/QZMEQ2539583.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa6746b7c0652a1b68c2e33d6eef47c2facf265508dabe8d6ee93fe581b070e4. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QZMEQ2539584.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x587ae259b892bf9d29610a1f56c4095523ec66d2944762c32fc24361004ca260. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QZMEQ2539585.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaacd2e4bde3a15b4b28e2b242c72a59ca4720a8782990af74edcbf3200b045d6. Chain 2 (Bitcoin): anchored in block 958600 (2026-07-18T19:24:05Z), 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/QZMER2544664.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84fa9c38a96589856085d4aeffa5584e9da0974a4aaed0abccc4e4eb23ccaa66. Chain 2 (Bitcoin): anchored in block 958991 (2026-07-21T10:04:40Z), 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/QZMEQ2539587.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb34b445bcd1b2675606d07df3d2296c26074caecbf7a4f5298ac58c20c8de00. Chain 2 (Bitcoin): anchored in block 959026 (2026-07-21T15:38:13Z), 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/QZMER2544665.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45feee088ea6d40c282c040193ce1ad7bb244b5af9871945676891da170dd3fa. Chain 2 (Bitcoin): anchored in block 960163 (2026-07-29T23:20:38Z), 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/USCGH2590229.