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 0x885e7924993e61af3c81bbd8f05452155dad867074c7a1c6475c95f9f7b622f5. 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/b382da48-f7c1-4a0f-ad54-1947211afcce.json and https://artists.proofprofile.net/proofs/artist/b382da48-f7c1-4a0f-ad54-1947211afcce.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 0xd127cb10cb2e75da8d30a212df14a4921732dee9a74adb39b823f134a61ee0ed. 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/QZNWU2135721.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf75262325f939d957aeea73018f95b4f19688e7bceaf29a85bbf2594cdd4c003. Chain 2 (Bitcoin): anchored in block 957750 (2026-07-12T20:39:38Z), 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/FXQ892200035.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9f3a715cc61f92a1c0a59bc264cde3649575069a4ee4c13573348882025cb5b. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T08:41:42Z), 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/FXQ892200036.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa29cf16e3c488b19d52ed37a6c281e340eb8263b934d1f3f663b5c01a1999c46. Chain 2 (Bitcoin): anchored in block 958075 (2026-07-14T22:55:31Z), 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/FXQ892200213.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x364dfadf86686043105cf32389af17c3efaa48728d418bc085e4819b080c2cfb. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T05:29:55Z), 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/FXQ892200215.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29127b1ca7adbe95e0ada340634b87b77c0e6026741b18a0c3c0fd3ce86820b7. 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/FXQ892200255.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff908ba8f5b19d374412015f1a3dca4ae837e249d741263ea2622bf4be479fd7. Chain 2 (Bitcoin): anchored in block 956745 (2026-07-05T05:33:35Z), 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/FXQ892200524.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7fd9f91e0ed438eadcb3a461c68b9ab343cfac5fd0a5dc0b10cb2df4c09fa02. 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/FXQ892200551.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1fd31ad6490051fbda2ccbc0e24906f438b4b5bceccf64ddfc767266696714fb. 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/FXQ892300049.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43f3f97fadde0119e011ef35408c1ffa401b451113cd605c1456753f57bc09dc. 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/FXQ892300255.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa469e59932cc6226ef73e8d651388fc79586ea0cb6fe414cbda16232ad7baf59. Chain 2 (Bitcoin): anchored in block 959146 (2026-07-22T15:41:47Z), 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/FXQ892300212.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf91bf5a71d0a89ab29e0035b67b5aa57748a420429305c0c31c5150a299498e4. 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/FRX282522801.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9509021ef225821247ec9b6b1570f92660909426e35c944de5c8b35508cf61de. 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/NL1LE2303433.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0388a92f9e008e135f56ddfedf028613292ab972b7a727f4bdff7f2eb215afd. 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/FXQ892200288.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcbf040b395c19a197d18b3b9e26e329c847d1a2d57bb913ecef71e8dbe1d8938. 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/FXQ892200287.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xafd4d17b653ac546869cb4ba9f2145e22cd0024778cb28736b45901d4867a1be. 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/FXQ892200286.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1440e73b8f3eccbaf220edd1d9ed00b2c8752840a1b8861c57aff0f9f035d167. 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/UKZGC2406307.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8318d0b02391c34c69aa082933d4bb7c993c75527777e3f252003a104c1ad780. 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/UKZGC2407072.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x154a31b335dc745c4801e97ad6c7a6fe69ae6e965205f589d87ee6cd3abc3f24. 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/DEH742430237.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x310a21ec977b76425fd3404b985fb032db68c547dcf925018d84c16e8ab9e972. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/QM3DF2223607.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x120ee5f3f5ee5097bb2ace36ec1fc2ae575c59c90aea601b8d49ddcbe3be4212. Chain 2 (Bitcoin): anchored in block 960164 (2026-07-29T23:23:05Z), 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/FR9Z62300531.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e6f1a5e29671093751564f80a0f36a0026498f8cd6a76163c9a3528c777ed65. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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/FR9Z62300533.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff18ad392210b27521bd3fabeb2ba305217bab9f195833470cbf7a0051af05a7. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/FR9Z62300532.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87c38f9b26ab4a52f794914db04b2ffdac3208ac986a06a5464bdcb44b0f75d3. Chain 2 (Bitcoin): anchored in block 960497 (2026-08-01T02:22:04Z), 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/FR9Z62300530.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87c38f9b26ab4a52f794914db04b2ffdac3208ac986a06a5464bdcb44b0f75d3. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/FR9Z62300530.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f9fdb2f1f74bd618259af2f9e8fb20d9c067f95afb5064f2d0d79c2cc83be3d. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/FR9Z62300529.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01188809ca87c58bf5abdb1af1b4ae76af5a49fec18598a89cc1ebbd95786bc5. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/UKZGC2407670.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0f9442061daae915c7c126fa31ff961a57730d89ee7fe452c2b4f53b23b0012. 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/UKZGC2409910.