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 0x44e19020250a70df45141ea7222b396610aa0a42c14a293420a4855095d02861. Chain 2 (Bitcoin): anchored in block 954667 (2026-06-21T07:29:20Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/e017cb08-2fd1-41c8-8358-bad8d4e48f62.json and https://artists.proofprofile.net/proofs/artist/e017cb08-2fd1-41c8-8358-bad8d4e48f62.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 0x5d8235bad8ce0a389a012cf36a5658bf5fca8444e096e4c470c67013d64799cd. 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/HUB282200854.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x941b0b4b074d023a36b927ab7a22613f9e45542d039cf8e315f54fb894b4899e. 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/HUB282200855.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40e8977eed216dddf9611f472d26026b0b2d7b1e846d2108922c723119b02324. 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/HUB282101023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x974c3c4507fc9c27715509bede38c2b6b9822448e68c613a34f58dde9daaa84f. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/HUB282200814.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe33f86f230c60f52283db1e9b1ec125ba952ca93b54650aebbbbf42727305130. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/HUB282200856.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea87101c96b677be07e697a34b03f227b14d66433c549c62aa8ce8e05650ac8b. 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/HUB282101025.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7395cf98d5d8c915e194debc97b1069e356b4e333cf52a63df5e1d0a144c0757. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/HUB282200857.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa01bb0481a8bd9130a67ba5f1c3b6ce32fe6b95db9329c345c6af1ecc5fb7bf4. 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/HUB282101024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xedf3cac49644a41b924010e5ca1d0434bd502ebb6176319073997a6392b68cb1. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/HUB282200858.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ed6c6fb76e44a5ceb9de0522abc3598bebfc8ec9d5998ff134e0708ebbbec55. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/HUB282101022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8116f87d9203a13e2b390e21878f9144412bd68e1f3e9e126dd5525f767cf357. Chain 2 (Bitcoin): anchored in block 960145 (2026-07-29T21:13:37Z), 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/HUB282400194.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb4a0d49437ba0ec822ae55241ad31e97532f3a091e3ebf6311f1ce7cf4b19a9. 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/HUB282400195.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4fc12bba1101e81e3fb6a65758a4d9fdc5eb3fa4e4e619b9fffd87a507d79fae. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/HUB282400196.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73b80cfcef80265a1728227dadf6694b942146728828ee2788dab84bab663b06. Chain 2 (Bitcoin): anchored in block 960404 (2026-07-31T13:06:57Z), 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/HUB282400197.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc840f492ce0348e0e3a5f1b83d05d6d5df0ea9941ea899aa4d2ec29b83fa327. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/HUB282301133.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40e8977eed216dddf9611f472d26026b0b2d7b1e846d2108922c723119b02324. 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/HUB282101023.