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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58c9d4d6022ffadc072c6049b151383e3473f9efe2d9903ac84396cbfaef7d4b. Chain 2 (Bitcoin): anchored in block 953408 (2026-06-12T19:28:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/b6cc0b1e-0f57-4e21-a808-281745dd403b.json and https://artists.proofprofile.net/proofs/artist/b6cc0b1e-0f57-4e21-a808-281745dd403b.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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c5f4c2e53cac36cc58229693ee6823abe41b3738f1b3a4347f9509d07df6768. Chain 2 (Bitcoin): anchored in block 957595 (2026-07-11T18:26:17Z), 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/QZNWX2077679.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67ca5a563439a2806ac5e42ffc370a032cf2bfc425a0f121ddba5a9052b246d3. Chain 2 (Bitcoin): anchored in block 957834 (2026-07-13T09:42:16Z), 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/QZNWZ2000263.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2fac694ccf9656a414d2b7a1bf0f82357c5ef21712517dc26de0d784788ce28c. Chain 2 (Bitcoin): anchored in block 958058 (2026-07-14T20:20:34Z), 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/QZNWZ2000265.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x686b063631c3db16d935bdc14fc67d8a6e451ad2695d7c93bdec9d49ab29813b. 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/QZNWZ2000269.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x912d28584cae8144f70b4aec46be8f7753c5e8a4a71af84b36a71ac196ef5923. Chain 2 (Bitcoin): anchored in block 957595 (2026-07-11T18:26:17Z), 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/QZNWZ2000271.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64e555f5506dccf8852709d4422a6deed4a1dcf6d75700f02fec3619371a9b97. Chain 2 (Bitcoin): anchored in block 958060 (2026-07-14T20:39:42Z), 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/QZNWZ2000272.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec16bec37a525554cb7c3fd9910f3239602beab295d92e1abe45df76c4d92fc2. Chain 2 (Bitcoin): anchored in block 957591 (2026-07-11T17:21:30Z), 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/QZNWZ2000273.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2ffc72bc9cc8df784d7a1f8c552ced48be023200bc67ed44cba7ba1fd0977ff. Chain 2 (Bitcoin): anchored in block 958153 (2026-07-15T14:57:37Z), 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/QZNWZ2000275.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33c74b548f219b6e4a340cad9de34dc5d7da879d97c3c5fe254cd2c072a7903a. Chain 2 (Bitcoin): anchored in block 957591 (2026-07-11T17:21:30Z), 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/QZNWZ2000276.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x721ec91f278ae8f014d56cb9e0e88c9bdd559649efcc49d44779b7145549b3de. Chain 2 (Bitcoin): anchored in block 957591 (2026-07-11T17:21:30Z), 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/QZNWZ2000278.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2dfbc1ec64c31653aeea918b45fc8719dac840088edc4379247e04f8e1a86a6. 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/QZNWZ2000279.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x94df1df6aee0769ded80c0d149e5b116da4e5a2545ea0fea63958a9ab2280359. Chain 2 (Bitcoin): anchored in block 957899 (2026-07-13T19:36:39Z), 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/QZNWZ2000280.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x574f19fccf6a5a03b7aa2822079b2dd431e986c0bcc82d625ebf01fb76b1b6fb. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/QZNWZ2000281.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd52ec6b2c6a6ab5e973c15005eb16a478cb07e64dcb62e1080848ef2fd25cd0. Chain 2 (Bitcoin): anchored in block 958543 (2026-07-18T11:58:44Z), 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/QZHN82107377.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce18a2e1d66000f0bd423e1dc79a3e008a2bb67842c85d2776c988f3d521f664. Chain 2 (Bitcoin): anchored in block 958212 (2026-07-15T23:25:50Z), 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/QZHN82107381.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d9ab3498c160759a9f383f42400b834c6c26b2bca7031cadccf0253487de5c4. 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/QZHN82107382.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfbd825d68a4382945fe03c27ab9a23269ecec2dc87e9dc4949ec5ebab192532b. Chain 2 (Bitcoin): anchored in block 958242 (2026-07-16T07:32:49Z), 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/QZHN82107386.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26db106203a147d6bc6cdc978b575536bfc13a806d4d82c00b93190e96c64963. Chain 2 (Bitcoin): anchored in block 958798 (2026-07-20T02:27:43Z), 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/QZHN82107387.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdeb54975472e1b67f33adaaba676679c3505c953c78c9fc227f41ce416fad2b9. Chain 2 (Bitcoin): anchored in block 958690 (2026-07-19T07:14:39Z), 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/QZHN82107388.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d0105246382e6694cd302fde91ef925a43d2ce46b4154eb5c87ff46d9db730a. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/QZHN82107389.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6174c4b6cc37b2e9e4a270b22cd026cabc1c06a00be8b63767af290d46aad67. Chain 2 (Bitcoin): anchored in block 958331 (2026-07-17T00:45:14Z), 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/QZHN82107391.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad9139eb8d9e755c9f29f8c66f1841d26fbeb760b367b50fbc7b4ea32e3433c6. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/QZHN82107392.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x116d220f70bebaaf4bc9b192b4f3eaec892d1aea4043b73b4c060524d252f3ce. Chain 2 (Bitcoin): anchored in block 958673 (2026-07-19T05:38:28Z), 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/QZHN82107393.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43060f653d2f6599f9de6d3ca8891b7aeefd9882447c9e34d601f4c3f885197e. Chain 2 (Bitcoin): anchored in block 958554 (2026-07-18T13:17:01Z), 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/QZHN82107394.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x719ef78aab165f67cf4e387958cfe3cd95f360e62c5faa118c9c86010fb90fed. Chain 2 (Bitcoin): anchored in block 958447 (2026-07-17T19:47:19Z), 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/QZHN82107395.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15ead4fa6ee036d810c4531c57f295c4be1ad40158b8b2075cbdc4ea942eea0e. 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/QZHN82107396.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46a3297b0a9b0b90f5ef3f9f518386f250d5c01d506d655a2bc8bace13f61e06. Chain 2 (Bitcoin): anchored in block 957965 (2026-07-14T07:07:52Z), 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/QZFZ42294790.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x040e6a0a7feb770458de477ecde81b6f1c7dc3902eca135a9cc9264a9527c8ee. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/QZFZ42294793.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21c3b2ea3fd1ec35855238914bfbc8733936c1eb27d2c4a061e600d9f7dac6c0. Chain 2 (Bitcoin): anchored in block 958245 (2026-07-16T07:18:46Z), 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/QZFZ42294794.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef260c033b66dee8a0576939e42e1eb9b3bd5c896754da5308c8882b24c9b016. Chain 2 (Bitcoin): anchored in block 957591 (2026-07-11T17:21:30Z), 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/QZFZ42294795.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34af20ad7789fddeea5b764f68d6197cfe7d161008d89e255b0ce03345d1e8f1. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T16:05:42Z), 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/QZFZ42294796.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8341ab687af2f1316ddfaa6e77979d8c68a60eb79886c465b024ffa2565cd076. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T02:39:56Z), 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/QZFZ42294797.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb60893dcbd23893f9a174371ab4cebe21399a34209d8606fa9fc63d2c958abf9. Chain 2 (Bitcoin): anchored in block 958153 (2026-07-15T14:45:24Z), 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/QZFZ42294798.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5cb0f00ea04ea572f5da07a64d5db1edd9f2bd8ed2c62bb5b2b87babfd7eaf2f. Chain 2 (Bitcoin): anchored in block 956738 (2026-07-05T04:47:21Z), 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/QZFZ42294799.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x811a0add25892c4ef4a8390dc9e0048d87b2acb16b4386819114a60866921432. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/QZFZ42294801.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b5eea9f818f4b8d69f71fb921ba917f312f51d4fbd0d155e54c493580e65f91. Chain 2 (Bitcoin): anchored in block 958765 (2026-07-19T20:52:46Z), 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/QZMEN2264481.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3302ffe6ba29bc4397eecee43d7d7a8712054df920c89bf76c7a128ba2f9e5bf. 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/QZMEN2264482.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9dd2dbcf78917a1e9515a534ae57227c058595638cc1fdf8c20d229e65e67427. 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/QZMEN2264484.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb6c02d3924f76b66dc7efece85d9dc2b9b006a33381aac81a8318341936224d. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/QZMEN2264485.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62e9d432de16f9a535bb11f6c8f6dacb9868e561f7b3623a3c76c9217993eb01. Chain 2 (Bitcoin): anchored in block 956476 (2026-07-03T09:04:44Z), 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/QZMEN2264486.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60dcf29b1ed007a4b7c0ed4379158c50ee7d7fb67c1ac144bf756b4de88a9952. Chain 2 (Bitcoin): anchored in block 956476 (2026-07-03T09:04:44Z), 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/QZMEN2264487.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xedb94d8b1ab0432a537e91fe18d3ea2a0ead7256abc872ba6f1bae46b6cb76d0. Chain 2 (Bitcoin): anchored in block 958996 (2026-07-21T13:04:41Z), 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/QZWFL2300711.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5459fae4f7059e0640c764ade751d3ad56e31758da5db41b9f50a24dc1342ac1. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/QZRP52549695.