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 0xb2e9e398d0ded952037765d3516b510a7fe9fe81ae7500fbb94b594dbf17062c. 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/d9a88d58-312a-4ed6-8b50-bfa7821194c4.json and https://artists.proofprofile.net/proofs/artist/d9a88d58-312a-4ed6-8b50-bfa7821194c4.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 0xd0fc5ae9a8be5958ee82bb6377a4ce23897174786b289c002bab7101891dcf70. Chain 2 (Bitcoin): anchored in block 960340 (2026-07-31T03:15:04Z), 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/BC5R32300057.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcedc377cfac7a6b735c61e5425ef0638cefc56336ba25bbb2a05e571ec8dd15d. 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/BC3PG2500301.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5dd812948752ea7c6910400d294dbdc0e79cde83859e5bdf07a287d97df40095. Chain 2 (Bitcoin): anchored in block 957050 (2026-07-07T14:41:13Z), 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/QZN882529734.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b425dcdd3945e9c1484c5857bb94ad1e433ab032de005875e7d1f80b831e8ac. 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/BC3PG2500130.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0fdf8de681240251bb637e1cc1cd08a7d6ce8bbe214fa121fe8c0426e7cc0ce. Chain 2 (Bitcoin): anchored in block 960225 (2026-07-30T08:04:30Z), 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/QZGLM2514989.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81eab493b0de6ff8d4f57a2267964c4b919992363be63f3af13e8d6eae6f4ff5. 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/QZN882515859.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37eabe62900fae3731e5926e687b30691f06d14dae15f3f61d14c6211c0d8048. 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/QZN882506173.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0bafbded49f2103eff89b3bdbbe478063c42b74db8c36823259376ac4a1f3649. Chain 2 (Bitcoin): anchored in block 960125 (2026-07-29T15:38:18Z), 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/QZW9M2431184.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x598ac474ea0a2e7a9749eb873d09026d5588f2c1d46ba13047c630fa362c6e95. 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/QZN882506172.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95dd347f1b2d9ef2aba9245a7c6dd21436eb4069cecbdbbe0897eb200be55a36. 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/QZZ8B2421995.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc75c8719ee24af8977ddf39940a64447e35622c38f3fe571791abfff28f81af1. Chain 2 (Bitcoin): anchored in block 960160 (2026-07-29T22:48:59Z), 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/BX4IU2417474.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2234e4730e971ad4eb824b3cb08375d44d4160a0c11a05a64ba7bde21512cd90. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/BXKG22400893.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x264b0c44b2869b766a9529a6180a9f483ca1a098e309f26a0ed12a21012732bc. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/BCNWM2100068.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x14c9ad0f80b9700b6ec363899a048c4acd43a1ca7038b3b233823636233e1c99. 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/BCIH82205854.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2cc25d35f0656712d84a9c9c689b8b80f6dddba2a4025759fee89b0bd3646495. 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/BXVK62300052.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0779e227bc953204d058427ac9d611b2416a0c329ec55fe3812ff4907e5ac4a8. 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/BX3SG2200277.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9349bff1e27d3480b191617d1cf09548baf1774354a1551e33a78984ab614977. 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/BX3SG2300312.