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 0x2931bd57c95ba4fe3c756ca983a3ac6428b99cc1a09d1ecc6a08caa2b7cebd88. Chain 2 (Bitcoin): anchored in block 954513 (2026-06-20T06:31:18Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/9e876fdf-8691-4cfe-b4fc-704abb8d3dc7.json and https://artists.proofprofile.net/proofs/artist/9e876fdf-8691-4cfe-b4fc-704abb8d3dc7.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
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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 0x20f2ca7922c422df5ff78e314e2f98339257fa7cb0bf8a8d294cd78df90ac6c1. 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/US5UL1207337.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2bd76906cc84ceecaa682e1b7f7ee58829dfb46843c0bdd5e7ed2a84abc0f0b1. 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/US5UL1340341.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50af772136c33885d80de25fda4542057131c61a7dbd94ba7618189b4628c113. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/US5UL0740814.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8f9486ad378d9ed7f1858cac17ef51e4ac9692a669f827bca06d95e5e77ead6. Chain 2 (Bitcoin): anchored in block 960376 (2026-07-31T09:09:19Z), 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/US5UL1434205.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x762677ea821c53635269accec220ba21d546d61433aa60142238d0b8950fc429. 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/US5UL0709531.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8dde84de5fa6b2e7e4df9c11de689cce0dd696afb2bf39927a19af9dfc694bf0. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/USY2F1100804.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb23e331a664e32d03186e34b49184356887a2cd5513cabf68140e285efc008e1. 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/US5UL1250507.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc522073e0c37c93ad1d96246056c4358dba546777699df43afc691b8bcf2979d. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/US5UL0741252.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xacf31175dfad5dd70a54a9821e73307ddaaef812469b9e5422e5dd16550219e4. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/US5UL1240895.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xefbcb87a0155fa862002d0f65b54e65de26e0acfe97dcac1f35cc213d058b939. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/US5UL1019942.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcbc2de469d4f3715b8b91a3c9cace10f524133ab223e66e045a30fb6ae29b65f. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/US5UL1419914.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0789ad923fb02fc6cd133f3976e826a0e0aec53e609b7e0d29547a9ff1c13861. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/US5UL0774320.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb01643df7280f24d7fa72a091f10d1390315f0545015045239fee2854d87c79f. Chain 2 (Bitcoin): anchored in block 960404 (2026-07-31T13:06:57Z), 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/US5UL1230088.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6947420b94354782d4c6c6b25d6f10edbeb0d380833cd8db107febf9b3cffdf9. 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/US5UL1216969.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc976e435ff475ffcf78df1a4639259f879c552445ca2f240fe80a80f09d6fdba. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/US5UL0688384.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4aea1043f7f216cb70c16cd3a64146b5c1bb7260e8679718b567f30798e219a1. 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/US5UL1232455.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x034eea2442640039e735282ad6b2bce9e277aff28b7d70136ad38dbfa7690efc. 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/USY2F1200905.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0445980803371a1b008da39c43ca3487ba3e8d3d2dde71eac10863d77a86a8c. Chain 2 (Bitcoin): anchored in block 960376 (2026-07-31T09:09:19Z), 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/US5UL1421728.