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 0xc8767378cd30bb335b67070e7e3f1f929f58a73b7a5042c897c563080e263cf2. Chain 2 (Bitcoin): anchored in block 953645 (2026-06-14T14:31:42Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/3dd18f6f-cbc4-42cc-a108-acc6c58604eb.json and https://artists.proofprofile.net/proofs/artist/3dd18f6f-cbc4-42cc-a108-acc6c58604eb.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 0x13db801bfeaa401da0101996ebcf1c004addf15927786e1d1b9020d6e3a8fb92. 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/QZZ792463656.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9f91d06d1ecd4371d361ffd4b4ee180b5ceab2206770945c13ea22b4476c2d7. 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/QZZ792463657.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc92ee4f5c4f5a3167179ee63a82313dd4a15fc6895095f1b46f847485aa3929d. 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/QZZ792463658.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f6600ac63684ae36994e7c2644690ae6473c73c80961535127a405e5afbd664. Chain 2 (Bitcoin): anchored in block 958276 (2026-07-16T10:20:17Z), 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/QZZ792463659.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1e7d0393a8b64064a41bf224977c6f9c4a6fe86f8ec9f4dca5e43c4a11924ee. 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/QZZ792463660.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb474bd5eb71f53423bdbc2dbecc717aa0b8bec9d00e82c1244f689046b3ac4aa. Chain 2 (Bitcoin): anchored in block 958420 (2026-07-17T13:33:01Z), 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/QZZ792463661.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f50f1a2224749743fcfde3f6b3ac1493147ea2f30c1091914903cf13c277584. Chain 2 (Bitcoin): anchored in block 958362 (2026-07-17T04:32:48Z), 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/QZZ792463662.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ae4d6d0e6ddeba7d18dff31af28baf120245201f13e4e91e323429fa66feef0. 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/QZZ792463663.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3cb4656468b1bac740b34a3840432521eaa0540db157d7c5394d068b6b3cca86. 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/QZZ792463664.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa055ccb4f3d7510fadec22a1617d4ab256fb3f750b03f4c341c98ce46d0f3ae2. 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/QZZ792463665.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce0efd388c607d894e8931636b15313a733a6c0910265a894d9b86bc7122a7a1. 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/QZZ792463666.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f49e0f1ed96f1996fab4be997c19132fa3ff0b642f67894dd0fac6c693b1e01. Chain 2 (Bitcoin): anchored in block 958362 (2026-07-17T04:32:48Z), 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/QZZ792463667.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa14a4f2697082598970fe29502c3cd275566cae4c449d461651a437c67af311. 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/QZZ792463668.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc6522415dac18503fcd5cfd66a64cee35951de197985e116c8f4e1a44675f69c. 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/QZZ792463669.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xccb168c6f329eaa15d972e5593dccd8bf380b4c3eb4c127835a5633451cd940f. 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/QZZ792463670.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91cd8ce4c5d49cd2056480a2fe06b5bae7a7183d7719c3f044c7fdadd34f98f2. 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/QZZ792463671.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb08c0821de2d9a3e3ebbc53ea40d5605b2220428b13564bb4ce7f2d9de5e8d5e. 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/QZZ792463672.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19218d60499c504ef054ca92cd3c4f9986fd4e21f20fbe67ec9bef34deaebc4f. Chain 2 (Bitcoin): anchored in block 958319 (2026-07-16T20:12:32Z), 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/QZZ792463673.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40615aa518f96a36ac29e9b529c31483092820adbe748066a4568788f8e6782d. Chain 2 (Bitcoin): anchored in block 958322 (2026-07-16T20:44:14Z), 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/QZZ792463674.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7949cfb58e2e1f52cc2ec68c58aeed471e359bc34da06f8f57fb09cbdcf4529. Chain 2 (Bitcoin): anchored in block 958276 (2026-07-16T10:20:17Z), 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/QZZ792463675.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d1b268fc442210c2ce6962ab40e03745cd5927a22540f912495b54db6ac47e7. Chain 2 (Bitcoin): anchored in block 958867 (2026-07-20T11:08:30Z), 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/QZZ7V2551156.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2638f55babbb5f9a4ca01e906a3cbefe49c0cec5c3f7fc23ae0135fa07267dfc. 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/QZZ7V2558217.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a005c2e533ed7bf9270eb5f4295e1712a65dcf8f66907882c5cdf5edefb84f1. 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/QZZ7W2508515.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34ded2766b265529337a08298064de6acc1906236525633e9c53108dfd3c66b3. Chain 2 (Bitcoin): anchored in block 958802 (2026-07-20T01:04:02Z), 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/QZZ7W2537630.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9defe8cf4d72c2287211db57be6c7494931274e47845e4d497e54d62c6b57a30. Chain 2 (Bitcoin): anchored in block 958567 (2026-07-18T15:22:40Z), 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/QZZ7W2539578.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xecf57cddcc2a229c96ade211079bc9ea93e49dac8b5f3c37990804fddc7dc63e. 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/QZZ7V2555764.