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 0xf17048df20bc1b077f591bb86f24d8ff0dd11192aa1a7000dd384b8af41ea844. 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/93164b85-08b7-4eb1-82ee-aa6cef575a26.json and https://artists.proofprofile.net/proofs/artist/93164b85-08b7-4eb1-82ee-aa6cef575a26.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 0x725839c3e360be5ed60268a6ff3dfe81db54d0152bcd4999270ea5695553b675. Chain 2 (Bitcoin): anchored in block 958987 (2026-07-21T09:04:56Z), 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/TWAN78600011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b79c2fb8d23528b85a91b27dcd72740e3cbfa35be2a2cdaa07d9901c2e7ac9f. Chain 2 (Bitcoin): anchored in block 959073 (2026-07-21T23:25:37Z), 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/TWAN78600016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa356bc8843dc5847bdc595e6b8c7be54537adad1c6296b7325c96e2562077212. 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/TWAN78600020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf15f80f297ba2ed55adf803c020ce85ec0fd464d496fcff5c26c929174ace452. Chain 2 (Bitcoin): anchored in block 958955 (2026-07-21T03:03:40Z), 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/TWAN78600023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x191c3ddec52d0c8eea87128b947848de5e3c053688c7d40234c212d4c693b436. Chain 2 (Bitcoin): anchored in block 959018 (2026-07-21T14:12:28Z), 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/TWAN78600050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcabebccf5abc1514b49f289606791b339ebb8951c122eb52535e16eed1ef7eda. 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/TWAN78600056.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x631e1aad854244b6dbf5c6cc4239bcbde730a84a250ac707472d52ac43329b76. 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/TWAN78600060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x797457820007e501114bdc2bbbdad977a01c0ba5d2faa84dc2edd24471d47c32. 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/TWAN78600048.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x740033c563c9c4d33d0b8ad03a8a293b831f2b0c291b132111b36e319f272fdb. Chain 2 (Bitcoin): anchored in block 959084 (2026-07-22T00:50:00Z), 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/TWAN78600029.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50c7716b186762312dd7197685c514892eb952c811056f7e6017aa0fb9812ef7. Chain 2 (Bitcoin): anchored in block 959054 (2026-07-21T20:19:31Z), 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/TWAN78600030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c75e2fd04fc77547ec839378612caae545aa2f1fe987564d0803fe5f7155c93. Chain 2 (Bitcoin): anchored in block 958935 (2026-07-20T22:08:19Z), 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/TWAN78600071.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59dcebfb49fe6171be11594a4743ec213582aabf6767ea6e2b78aeeabdcbcbad. 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/TWAN78600085.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a8ce40833fda45721cca845ecfc8f9ecabe7a4665be36fe7db147e31297eb00. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T15:22:58Z), 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/TWAN78600066.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b7f68330124eeabfe70b652dad85a6b30f68a3fba6f3b2529656e2083af3923. 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/TWAN78600181.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ae61dc0513ae0b9137e0a0c210fc6ca51b0b7e52c60365e8b10b6db821015ed. Chain 2 (Bitcoin): anchored in block 958897 (2026-07-20T14:57:46Z), 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/TWAN78600105.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20ea2d7cd1c93b878e2658bb88999cbb37bb19451420a1f411e15f0f9868000e. 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/TWAN78600101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe65326ef2952817dee96d3ddfad7a29e23e55c759ce3d6f470c7e0559e639a2f. 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/TWAN78700213.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0cfc4d08bf675e4261a0e8d1fdc57105ce9a0f596e5c691bd5492f0761f23879. Chain 2 (Bitcoin): anchored in block 957061 (2026-07-07T16:07:00Z), 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/TWAN78700198.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47158e66eacd16fd173cc2bf577d9bfc8434f17e85ba0a457d87f7f8589f817c. Chain 2 (Bitcoin): anchored in block 960216 (2026-07-30T06:39:12Z), 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/TWAN78700202.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83df1710b0a7fdbdfa5a60417481c6f08a28a8ecfccc581d64a4b89582ef3a0c. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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/TWAN78700207.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ec4b3aa195bb57ffa460b8002961d2d02eb7a2d2112d47afc2f929000ef2e0c. 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/TWAN78700158.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc23cbcc12ebed3cd88e67004b9cdf16822d9186fc96363b1f1427985c9933284. 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/TWAN78700159.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa89f46d79d31a7cecab739bf7f68d2abecb7cbbc8edb5197d54646fbe5cfb30b. 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/TWAN78700160.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68a27d9297de3a369893a5bb3d7ac28746cc33267987cd45fca4292279607c8b. Chain 2 (Bitcoin): anchored in block 960294 (2026-07-30T18:46:00Z), 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/TWAN78700161.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3307e3c12e00349f3c92335ab21751081dfab5a24da8a75835f10e6be629f6a3. 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/TWAN78700162.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8d2c3f4d7ce4b52fdd91ee4b252dc5daa95c254fefa3e3e1fb588e9332f55bb. Chain 2 (Bitcoin): anchored in block 960268 (2026-07-30T14:53:07Z), 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/TWAN78700163.