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 0x8c6a20a0f57dead1664755dd89dd01ea82d96eb7c7d74fdd479431070efec6b8. 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/537500a3-3aca-4ab2-9298-3e72255fe962.json and https://artists.proofprofile.net/proofs/artist/537500a3-3aca-4ab2-9298-3e72255fe962.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 0xdfa161e412c99604d11c15671382f457bad981174f9fb69184ebdcaf2770ea87. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T17:25:16Z), 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/IL1011120983.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a4f14b3f070d6690a530dba03c10a87d8a32db7bc53a639d0a7eaeb58002363. Chain 2 (Bitcoin): anchored in block 957805 (2026-07-13T04:34:37Z), 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/IL5841720182.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf29bec1749131f9591c58311c34682ee9250ba16486d49743755db3e1cf02a9. Chain 2 (Bitcoin): anchored in block 958805 (2026-07-20T05:07:07Z), 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/IL5841821529.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa34cb71e6b00536c020140de85dcff0236c8630d3a45458a74acf4cf4c6f5e92. Chain 2 (Bitcoin): anchored in block 958711 (2026-07-19T09:26:32Z), 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/IL5841925010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcffa6cfda764bfa2add4e828ad7cb5b75f3c1e581dd5acc8bbbe607e17ec9297. 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/IL5841925251.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f5e48d1f562d471f8214a07e8148ebfbc53843779d09a58c2b040b4278cb620. Chain 2 (Bitcoin): anchored in block 958510 (2026-07-18T06:38:22Z), 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/IL5841926496.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11e79cc066693b6d6fc899d7f57c2bea3095889d84e21c87cb580cb17e305441. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/IL5842235419.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9dbb18c503a196b125b94a65905b4e30c45db9baedadd30fd6250ba9533855d. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/IL5842235420.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0db81e84d94a22d19587824a833f41a5c7792f225bdc83c9a36213af01d8f48. Chain 2 (Bitcoin): anchored in block 958256 (2026-07-16T07:22:18Z), 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/IL5842235421.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9059915effa4be2b072428330bd13b1cb8fae485568f9729d938ace57987dd68. Chain 2 (Bitcoin): anchored in block 958716 (2026-07-19T10:15:55Z), 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/IL5842235422.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17875130501788e424cc4536f3713232a79e67209db724dfb987179862deb4ef. Chain 2 (Bitcoin): anchored in block 958816 (2026-07-20T03:51:05Z), 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/IL5842235423.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7dc01f1689f38af5681b59ad2ea47a8ed91dbd4674c5b33622ddae024ffb7a18. 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/IL5842235418.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xefa3368dcf69e9f1b53d998ec51f49689911e8cb79b2fbedf1ffa97dacb4f4b6. Chain 2 (Bitcoin): anchored in block 958716 (2026-07-19T10:15:55Z), 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/UKR6V2290873.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0666c685c17abaad24b9982a3392b0a5a1997837893a46fb29f0d27298654a48. Chain 2 (Bitcoin): anchored in block 958216 (2026-07-16T00:00:34Z), 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/IL5842237973.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b83e981312ba183f9d2546722bcda9b53fa299d76f68e9dc96e9451a7aa8860. 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/IL5842341258.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b8868867a216078aa2973f7d762a559a5308320058a01efaca722f401f8c3e7. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/IL5842341876.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0dcbdbd77531c8be2ab65f0aa0d1553358966b4c0122c8aa26ef4282069d87a5. 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/IL5842341877.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3b7fdccdadad56e8833ff03f3b1d8026cca7d4dfbc4b606cfe08e453a6498c6. 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/IL5842341878.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34861548af6a513bdf31e567dfa4355249f089e3508c44177b99cd8f9d502f7d. 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/IL5821501564.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x522f2a1eda857c0a8a44d0d6af056ead04a36cb508dab26dee856e20dd1adc20. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/IL5842444528.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1199238f7d4cbe5570219c4558ce471617326ac7958ca0dec0503d6b0fea2e75. 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/FRX282133902.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f32b862c14f89343c982adaee38d21d7f5444268c4190b0eba5ea28ff6e9dc7. 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/IL1012200609.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3d8370a855d6ef7d04dca1c9bfe17156aee53e54bb80ad17f4c18cf28db5180. 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/IL7022100187.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x865058d8cc56d7aa490ca8faa7d045c4965c51943fc66baa60a02e01028e64bf. 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/IL1012400815.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x280040bf9cbea45aa32123c0fef503772420b82e75f67300d9f6c58052ad8ab1. 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/IL5821501368.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0af70c69a02219654dc57aa2548d2934354682d3ccc91db0ef5ee0c9e3814c0d. 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/IL1012000839.