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 0xa9c75e169dc40c19f8285f320710bf98c28506208dc5ec8b83098d42f9b61832. 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/cb8e7b32-4f21-4e90-b7da-1b12fa57e7c5.json and https://artists.proofprofile.net/proofs/artist/cb8e7b32-4f21-4e90-b7da-1b12fa57e7c5.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 0xeee421adf6b8d5e07ff836202c2e91f76252ad24e023ae8cdcf4b11b922cabfe. 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/USUYG1381481.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4bbb4022eefb9031005f83f827d8bf1c40c05c17ce8f74249ef19cd50d90d007. Chain 2 (Bitcoin): anchored in block 958650 (2026-07-19T03:36:41Z), 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/USUYG1381482.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3eec884058d1cd26c481a9685016257f09bd96ade3e9094093ccbceec38640ec. Chain 2 (Bitcoin): anchored in block 958728 (2026-07-19T12:24:55Z), 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/USUYG1381486.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc61fb51a5645bd3c7ea5500218d6c122b2949f912646829465f57b4853068e5. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/USUYG1381487.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8bbf091f36b436142db843f2a724e1e84c96eba6364ba0f351ac23029f0f9557. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/USUYG1381488.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x636a4d26eed9ac4b90824116c0f6283d777acaaa3c7c32bb8c333d9337f29aeb. 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/USUYG1381491.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x171d4c7863468b529ea725297be4b295fdaca390ba49a50fc7e324dd151633e1. Chain 2 (Bitcoin): anchored in block 958838 (2026-07-20T07:01:21Z), 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/USUYG1381494.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78cfc6d51ad34be7f2992d5d9ba1fe9f9f58f0082c0e53d9e171359a3cdc31ad. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/USUYG1381495.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b1efaaeb9f3cd9daddb7b89df8a3b7a7b5d1c9e6fc33e2c772d6df5cd2c30d8. Chain 2 (Bitcoin): anchored in block 959009 (2026-07-21T13:14:47Z), 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/USUYG1381496.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb2df35098203ad5be1666c2d701f02bca9465f28088385857e5b33df5e30d3c. Chain 2 (Bitcoin): anchored in block 958228 (2026-07-16T02:46:47Z), 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/USUYG1381497.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e05d6137d22f2c880cb1643bbe23a1eb47d47d7a52e86940db459a321d2e878. 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/QZL382259972.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30aeddd088b30498216cf5c07a6315a9cae6f6cc0efb3d638039b0ec36955f77. 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/USUYG1423554.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28b7f2166f8c9a1c642f6a07e56922171b15152cd3b275b0555718b36f1e2ce7. 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/USUYG1427141.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb63e25c3389b9c0c4477f71bdbbf57879111036acf58ac71668482e5e89a4212. 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/QZFZ62329426.