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 0xb3da0f5440136611ef57fa8ee779ba057a5303fb392e99da42f4db068a4c6f66. 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/2fc31d59-e0e4-4f1c-adc5-e187ddc9bdf6.json and https://artists.proofprofile.net/proofs/artist/2fc31d59-e0e4-4f1c-adc5-e187ddc9bdf6.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 0xc8d6a292759ea78d47ab45d65c54c247224c4918dff14a838977ff527994cd4f. Chain 2 (Bitcoin): anchored in block 958788 (2026-07-19T22:07:06Z), 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/QMFME2403626.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2863ab98f52af813092162ee553f2bfcdc4739257b033d26bb41061965085fa8. Chain 2 (Bitcoin): anchored in block 958268 (2026-07-16T08:56:51Z), 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/UK6821401612.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3605df2dae3d750ce3ca09e1a9001b87ccbaaa6cfe83e607cd223570230a01f5. 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/UK6821401614.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea9b39df077a870b211ff9f5f0dee9dbca34e07dea8ce6cf276f45819ccfb8c5. 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/KRMIM1904666.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd99ae97ad863f80fcb4bfca7bb2dc98207246aba628dea41a8062cb61a07c511. Chain 2 (Bitcoin): anchored in block 958371 (2026-07-17T05:45:43Z), 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/KRMIM1805120.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5bc3ddfc50444dedd42b5876dc1df71769fc3d019199c23ccd3ff0ffba31fb6. 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/KRNAR1803443.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea9b39df077a870b211ff9f5f0dee9dbca34e07dea8ce6cf276f45819ccfb8c5. Chain 2 (Bitcoin): anchored in block 958700 (2026-07-19T08:09:50Z), 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/KRMIM1904666.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6dbf091cad810b9bcca457a51e7deaad721362c20c9e41b6f4d2a59dd272607a. 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/QM4TX2290119.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x527e60fef6033b68913ddbfe773b51bf02b6498b0e6a70e2165b972a6533f4a6. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/QM4TX2378976.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1f48bd61ac88628d365c02c16a5c6900835d7f604202a8c67122f3f36fb7c8d. 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/QMFMG2378059.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6ba7b14df57a3afd477d8fe5eb8f849d92dc201bdc46e25b833ac9237d31628. 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/QMDA72433194.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6ba7b14df57a3afd477d8fe5eb8f849d92dc201bdc46e25b833ac9237d31628. Chain 2 (Bitcoin): anchored in block 956637 (2026-07-04T10:56:23Z), 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/QMDA72433194.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x751d8fd52031d00d963817ab2973989de8e77e0e6214dfb8b2f0b9481836da4b. 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/QMFME2406973.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53b2627212be061db064d03b01c57a71e0157133a7eb799c1759f714a28bc965. 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/QMFME2406975.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1195d79d92f3ab2beaa504d51a188d6e2842eb1cbb0cce3e85b00197fe716d6. 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/QMFME2406976.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x802bfd01c007597cda2fe076692b1bdfbb5b7e5631809af972fb62185cf9d78c. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/KRE892500018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb28fa2336cc9ede79063f318d289dd5afc060aac29da4fe3f3aeed043a8e7bd. 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/KRMIM2028187.