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 0x05ec9e489eeafb76a3b20f79b603332c58c7a689cc6e158117f49d8685acf042. 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/c10a4ef9-df4e-4d08-b439-585063ba4f8c.json and https://artists.proofprofile.net/proofs/artist/c10a4ef9-df4e-4d08-b439-585063ba4f8c.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 0x8f7e6c53d7ede3293ef247f96eb0a6bc20924e45d441bba202c5f1f7769a6984. Chain 2 (Bitcoin): anchored in block 959087 (2026-07-22T02:05:55Z), 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/USHM92054033.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36f7bc7aa3105703aff1343f7177bccb61fe2383f3ff058bc0c2bb0ba9b7f1f9. 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/USHM92052978.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ca1650c07fc6a84d5e847b184510bdd31caca9fc5d5a94022ed7bd53963cd54. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T13:14:32Z), 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/USHM92052979.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00fa2926dbd9a3353e7ab34a5bf7696fc1dbe51f9ad1169dd905e09c2021b5ed. Chain 2 (Bitcoin): anchored in block 958686 (2026-07-19T06:43:29Z), 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/USHM92052981.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23f87457abd04086da583d400aad60e35f3af5a93ae868f5d10a3863b6632b23. 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/USHM92052982.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1c4c13cfcbeecb29f7ce30a93b35107dd82dfcd9f9268fdc4be78f036d8903d. Chain 2 (Bitcoin): anchored in block 958208 (2026-07-15T22:40:25Z), 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/USHM22183752.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24c39d78675cf8913db6288e5b08285c0f7c574339d65feaca7e4a9605c1e572. Chain 2 (Bitcoin): anchored in block 958686 (2026-07-19T06:43:29Z), 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/USHM22183753.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44c32a342ae0252b726a70a948a6aba99f4f70ccfb67fc4ef068bb464f993e4d. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/QM4TW2325188.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25385cd9c9685b20bd2c2785e9f9897fba4994222d2103bc09dbd71858e308e6. 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/QM4TW2325189.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85ca47eec7f9dc0e43601605d0d6078d629bba29d05ba6346a154a76557d87fb. 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/USL4R2301355.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75e79450546919435ec70e46e20a02e1fb7eded59df7ab756b9264f86ebc64de. Chain 2 (Bitcoin): anchored in block 958058 (2026-07-14T20:20:34Z), 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/USL4R2301357.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdbdf43800a3d60056784fd32b5486b361f88b2972f6b026cbe220ed1d7c4f9c2. Chain 2 (Bitcoin): anchored in block 958686 (2026-07-19T06:43:29Z), 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/QT3TB2400612.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe204010d82b42265b6e7571329a4fbc3b15bcdae665030e09f4b20a4033054a4. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/QT3TB2400613.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32a104c49e96c9e5f76b0ac4380200bd20948fe2bbb3685e1e1bc01dbaffff28. 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/QT3TB2400614.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26ce1744eed8788d636671ab4f9a920214b49036160eb3fe2972df1dfead4aad. Chain 2 (Bitcoin): anchored in block 958058 (2026-07-14T20:20:34Z), 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/USCGH2502898.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfece910d8e0643eb1895429f37296374910ed67a23bec7231d2dea888a3010fa. 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/USDY42573310.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0c8e784e1c78ed80ea6fc69dc2ed0d315de6105e4cec2266899ef4753d7f7bd. 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/QMDA62288461.