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 0xd3ad7374355b0cc7c4d479dce6262bfcc1203834cbc6255fee8555d4d48da350. Chain 2 (Bitcoin): anchored in block 953842 (2026-06-15T22:22:30Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/ecf334f0-e395-4050-a0d1-3e64b6ee5a06.json and https://artists.proofprofile.net/proofs/artist/ecf334f0-e395-4050-a0d1-3e64b6ee5a06.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 0x1c3fc972747bbb8c620002259c9f560c47eec7890275953ca126e153d3fb3556. 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/QZFYY2161807.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x793ba75b05b3db62d6eec2176ce5cc305491a09886972a260c41b0dbe3c17006. 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/QZDA82182585.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf84b101100b2f270abc7715bcea58380a60092f3329195afe6b60482d08133cc. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/QZDA82182586.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c3fc972747bbb8c620002259c9f560c47eec7890275953ca126e153d3fb3556. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/QZFYY2161807.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbefdb3a98dd12d2c5611bb106dfb2c62df714a18e3412397d3f665e843c83808. Chain 2 (Bitcoin): anchored in block 960240 (2026-07-30T09:57:33Z), 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/QZDA82182587.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32861bd48ba5e8a8545c17cc9a50a82218689cab03264dd2b168e6fd17cfebfe. 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/QZDA82182588.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f522ddc87b51b50312860e8c7096861f52855095cb0a07eee77005f4a326b92. 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/QZDA82182589.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42041cdb03ebf10a5bd88dde2ab135d6390459a7030840135e06d3deef6b00a0. 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/QZDA82182590.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d3d6fa6ea06acc8adaeadd3c0f8747f96bd9118ea44936538f98f90758c046a. Chain 2 (Bitcoin): anchored in block 960220 (2026-07-30T07:28:30Z), 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/QZDA82182591.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf983076e1ef274d66b8afea3aa204b3b7527322d34f7423932ca32926d4c19b9. 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/QZDA82182592.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71c32116ca42686f5ccd8a41cd758b27867854e3f8ef7623c7c666653e5d2529. 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/QZDA82182593.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x225c9ce9ba6c9367c374621473e18eee86f00c8eb063998a8ccfa39650e0d2b0. 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/QZDA82182594.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99b1dbe49208b39caa44fe51d21700b138d3f697b455a021d032fe800ce41828. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/QZDA82182595.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf761683191f7d5f2da4498c900e81a9dc60e5deba2245e5ba3dceb77ef2a29f8. 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/QZAKB2207307.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b90ac770dc0bcdbedb8094cc02c45ebc27f429a6e5b352ee5869cbe4c31d615. Chain 2 (Bitcoin): anchored in block 960209 (2026-07-30T05:15:54Z), 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/QZAKB2207308.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e078fbefa1daef01cedf1727e7c5ad1640b30296c443247e3f62a7f507ed212. 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/QZAKB2207309.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0c7b75448e665518f20206f705732a94bf132ce0463b61f23a4daf830295f26. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/QZAKB2207310.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88ea9d1f4eca582d8d5f7dfb62c5088a834591e40bceb0f7d153c25b32555d80. Chain 2 (Bitcoin): anchored in block 960337 (2026-07-31T02:51:48Z), 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/QZAKB2207311.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce7a988ddde38c73f8c360a16b4be08fcdf3a2650f69319888ffce550f46c032. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/QZAKB2201658.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xece7bcceb6e9d6ea3c44bb877bcd3fca3b7d913a54c6283c1b6d87522d04e0d2. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/QZAKB2207312.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcdeda9ec428d8e4927a5922a6048e59b40a247fe73e02670b05df10d5cb72390. 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/QZAKB2207313.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85ef982aa7d3f40cc46a753f3afa1ff54aaa1d1e5d390b7d420894fc3b659452. 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/QZAKB2206874.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2f2c171b3e153d8aca2db8342eab8f1f2a18528e249b26e164d49b0b59d21cf. Chain 2 (Bitcoin): anchored in block 957075 (2026-07-07T18:50:38Z), 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/QZAKB2207314.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6bbb338ecb1939142162ce9a5f4a0750601d5ccb6ce2a4537a8c205cae24394e. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/QZAKB2207315.