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 0x9e5cec030d524381c37d0793e07e916465717787f5ed614b19f55d2a1dcc1985. Chain 2 (Bitcoin): anchored in block 953778 (2026-06-15T11:57:35Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/ba2d6692-ccaa-4ef2-abc8-efeedd2c6987.json and https://artists.proofprofile.net/proofs/artist/ba2d6692-ccaa-4ef2-abc8-efeedd2c6987.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 0x7c33706756528a33aff91a9969545da6d7a6bab39015aa67ff4ffa74238e6e7f. 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/QZNWW2082930.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0101c2f5881cbe16dc0247bf2375c1fe682d431867c8681cd770e9009aef806. Chain 2 (Bitcoin): anchored in block 960376 (2026-07-31T09:09:19Z), 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/QZK6G2053795.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77e91ae9983897a8afc298850216354787627b6a9a7102060e95c7496f56faaf. 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/QZK6G2053800.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ea68e11d2bec0b8c40b90a12e2cd18d6d3d6757d6c2df8625bf2287874f5f64. 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/QZK6G2053811.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x628601df12ea2701987d4f5f0fa869dd11acd7b4acb821a683c82152afc04a18. 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/QZK6G2053812.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x250e92d676d21f3f87accbf177eca813d21f13deb145d5dada5a1ea2fc134874. 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/QZK6G2053815.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1e4e308ca3b1b345577f2e245297555d9b7a1d1219985d3db086c114047a72a. 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/QZDA62499847.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27183629d7f4adeb45614ba092ba4660465be2c55e4f6b082887aa5ffd52b341. 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/QZFYY2499789.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2507b93f16821dbd25a40affc268d7b08e882978d9018294109be78dd516a9f2. 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/QZTB82384808.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d54ebd2ae396845e7d6d1f05e76a4a8bcb127e4a6a78c80d16137b85b326742. 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/QZHNC2346588.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89c1ff43dadb5a1944525e7c8dea5871014cc3b7c04977d2520d0e6819440f83. Chain 2 (Bitcoin): anchored in block 960459 (2026-07-31T20:22:46Z), 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/QZFZ22314756.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44ae8a39f352689800258c31aee317d579e13a357d685492f76b85fb1a205ace. Chain 2 (Bitcoin): anchored in block 958041 (2026-07-14T18:13:17Z), 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/QZNWV2202656.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5fd9b3aa48b64cb97952b23c4c4259b27a27ef415d3eb301a21c86cf72ceef80. 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/QZMER2213480.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67aa5674dd4c051755e3b5d5584f0c3510af2ccf9ce536cb3a0e412c83ead787. 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/QZFYZ2293262.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65ea97ff9cc1bdc087dc714523cf353a8a4d53925ba64dec8ec657787867bb1a. 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/QZFYZ2114230.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8761623261799d5499b44445399823bfe39c68878a781e8eda60ee6097def8a. 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/QZNWS2077676.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39d63f0aa39291b3ab857a047d7318f7a66b79c0f720a3a4726dcad787ab60d2. 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/QZMEQ2097097.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6bd9688ff50c2972e6e553928c40e51e2e82a13c6874c9298a73f1c506fc3d02. Chain 2 (Bitcoin): anchored in block 960247 (2026-07-30T10:42:33Z), 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/QZMEQ2097098.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf52c6ba8c3d05e59a8a35387802c077ca56a6f02bda00359ae8a98ee913cb5e7. Chain 2 (Bitcoin): anchored in block 960340 (2026-07-31T03:15:04Z), 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/QZMEQ2097099.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc7a8ef8c8e20d4e34089300e6ecbcdca0181738b9b29f8d00abdf7e8dd28806. 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/QZMEQ2097100.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04a2550fef72d6d2f48e940ddd063e509c3671391b2f79f640bfd60aa975f76e. 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/QZMEM2068320.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e6b8e83146efce9f1878126f20d7a21ad3ab2a30ce497fb4f95517f42004c8c. Chain 2 (Bitcoin): anchored in block 957064 (2026-07-07T16:43:08Z), 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/QZMEM2068321.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d04662295cfc42c34f2f7553763b27914772d65dbe8f6b8cba7c85cb39897aa. 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/QZK6M2059237.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb53e4373124c9b37a7d948986060125b8049be9f94e6763a37b3218a8c8854eb. 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/QZK6M2059238.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4866fc9c8fa072f0070c716e636704cefb9ae4dcda008b75f8f9c9ea49b0fe4. 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/QZK6M2059239.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa52e3c7f37c4b043f99010181becef4e7c56ff9670f96ca364b60deb8744d4ab. 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/QZK6M2059240.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0aef52dc91aba6326aaa2d3f6ca15eb7e402e7b57d381d77c1a1a99f2c39af5e. 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/QZK6M2059241.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd84ec52fa364f3b936c9826ecdbcece17b610889d3ee5a84e22c9f65e054abe. 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/QZK6Q2083066.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2138cccf27fac6680c04e5343fc553abbf5a1299f327b1d59d5d16c365452775. 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/US7VG1319566.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8870f1b38f8bd70f17a919d0a8c3cdb013094b31f7c11b90cdc60413cc0a5faf. Chain 2 (Bitcoin): anchored in block 960463 (2026-07-31T20:42:35Z), 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/US7VG1319567.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e6d95cba2550710f1ee64064a15f6014dfa1cdb30ca0f168c938c59158cb895. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/US7VG1319568.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57f5a316ba9290c53d054f3c431f644475de8257973b156b63160fb64869e435. 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/US7VG1319569.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7718d1f39643b9174d71007868f86547c4147388845d61372a8d781bfd8fe23a. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/US7VG1319570.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4dd6e265c7a13d516a989a500bfa37eb236faab3b94f83d6e6f306f2434262ae. Chain 2 (Bitcoin): anchored in block 960314 (2026-07-30T21:00:46Z), 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/US7VG1319571.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbca1113626ed0db147c369193ea0be1a06fbb156e2a9f185964b5eec126ba164. 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/US7VG1319572.