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 0x41a1d60e20b874cce963f865d6357726ee0065d5f11287115093e0c2d84c61da. 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/b4182979-b263-40a4-a6cc-5d6aa174af6f.json and https://artists.proofprofile.net/proofs/artist/b4182979-b263-40a4-a6cc-5d6aa174af6f.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 0x0f20ad7c057a2405a79cf12690ccd9f4f2950b74045d668340a550d6244d6ccf. Chain 2 (Bitcoin): anchored in block 958384 (2026-07-17T08:27:02Z), 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/QM4TW1744299.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c3cf3b7dcf23f1481a924342c090b0384239b52751d7ce1c20b8e9b7e543134. 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/QM4TW1744301.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfff68a9765d43c36ea84bcfe4a640c666ee68bbf7a2f1fbd0fc73f7ea7888740. 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/QZARB1832380.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe111d20c956c3f9fa15332600bcd648f01ffd6a53ec9c5fc7ef3d4ff56bbdefb. 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/QZPLS2135731.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe111d20c956c3f9fa15332600bcd648f01ffd6a53ec9c5fc7ef3d4ff56bbdefb. Chain 2 (Bitcoin): anchored in block 956576 (2026-07-04T02:06:47Z), 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/QZPLS2135731.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7c558bedaca7048435389167eda79c4af76f18d52f9c299643c872cd43464a3. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/QZK6H2223422.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79f40736ac3ad1b15417d136fc1bf0a0e151b2f761b171d0686c792b0eeaff6e. Chain 2 (Bitcoin): anchored in block 958465 (2026-07-18T00:04:42Z), 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/QZHN82330039.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x14860d89787a19ff500a289f0c11bb64738b928427619278200652eccac39a55. 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/QZRP52256368.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1b05499741fa55ff44f92288376571a4426b93ee1d7c35d325fc82c0b885d59. Chain 2 (Bitcoin): anchored in block 958383 (2026-07-17T08:20:01Z), 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/QZHN82330046.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf4a52b1b40e1bda987ab381d41657d6d4941ec3cb3c885119da346083e8150a. Chain 2 (Bitcoin): anchored in block 958468 (2026-07-18T00:27:51Z), 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/TCAIK2422248.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x345e248208d2f9a8043227e5ce608c2ed05d9a71855fb55c792634b4928c868a. Chain 2 (Bitcoin): anchored in block 958197 (2026-07-15T20:40:29Z), 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/TCAIM2489443.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f84c9096ce784198e18c3c38628f374c7ffe47d40824e8b9642e9d5973801c2. 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/TCAIW2495889.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x587403b57c545c0483ba394846af97cdb88a749a30aa468ac8c90597845077aa. Chain 2 (Bitcoin): anchored in block 959052 (2026-07-21T19:50:27Z), 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/TCAJA2498468.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x672719aa52e871237c18c4c2a42b08777cf61f82f60bf80843f306a351867e93. Chain 2 (Bitcoin): anchored in block 958746 (2026-07-19T15:36:35Z), 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/TCAJD2406570.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4bb569a78ca6e986a924d85b6cc400982308f393b01b81950af200a43f73bfa5. 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/TCAJC2451549.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1575b78ea84045147e481ecaa742c75785f0944ea0a6e1fa77428988c0161ac1. Chain 2 (Bitcoin): anchored in block 958152 (2026-07-15T12:00:27Z), 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/TCAJG2558041.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ca2599e1c0c5202df05bd8ce26cfaa25f9b7a1b6fe81f295c7509f34db4ff3f. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/TCAJG2558051.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf579ff874334072c17f09c6e36892673aca14c40adbefc81561428d1c81d0c37. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/TCAJG2558062.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd99da6c514bdb24ebf60db2bb0abc58f953f7cf3330c292f9377ee607078626a. Chain 2 (Bitcoin): anchored in block 958428 (2026-07-17T15:15:14Z), 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/TCAJK2533417.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e3b13514e71bb5d5cccb637212ec40d9bf78c6091fbe4bfce4d83d2ec6d1b39. 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/TCAJO2528082.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xadc15ae932c5a8c7f583ca9f6c15f9d5c29ffc6047cac5d8b3a97f02c306bcd7. 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/GBKQU2065743.