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 0x7f5acfc602f22eb1028574131179f9046717a348ff8ff8c0c381c5f5c36135ab. Chain 2 (Bitcoin): anchored in block 953746 (2026-06-15T05:25:34Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/a300f8c4-da71-4857-bafc-b4a229400a28.json and https://artists.proofprofile.net/proofs/artist/a300f8c4-da71-4857-bafc-b4a229400a28.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 0x5585c0da94cbfddc5a9359c7ddc1a8ad1aa29936c6edf17071f459ce7b6c7005. 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/QZK6G2442009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41fe12f0923ab0564e3ba712c8ed8106876082b21eae370ec917b574e0e50d8d. Chain 2 (Bitcoin): anchored in block 960212 (2026-07-30T05:43:45Z), 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/QZHN42474069.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74dfb712840527dfb88a1a146a7acb1026f1ee219e66e0e43e7dc8448e6c7f46. 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/QZES82400664.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7869ee20d610208d646287be25ad4f8e4bd6a34bbb5e7f5683e4e92ca9f21635. 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/QZDA72498921.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00b4cb5981d3d313779b06eabeacfb0508d3030ed373365c19fe98fe0d6e0016. 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/QZFZ72424677.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5fab791e48849676aae91b2c10fab9742f11abf587ef5234e8091987ee8d1ab3. 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/QZFZ62400242.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98cb205082d977142099902c87cabc63510fb0f8808c2cc50d2d67620456f915. 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/QZK6P2366363.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcfe907b81e1406655e3f922a2f5b815e27d7e7abb4cb1cd9b38d17a2240b5337. 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/QZHNB2370539.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe419688fcb6f9554e94fbcc7cae4bec1e5e9f5802b1622102a3dac811d36fd27. 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/QZHNA2389258.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86c38f93f7f610433e8901ecde19388c7663439cc563104fa71297fe94dff196. 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/QZHN92378600.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f08e19f6b0466e02414b02b05f0a1bfb764728b2188b14b6853773c5dd610b7. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/QZES82232104.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x674497ce361ffc22aef63c74daa7c4693d400beb87caa89d153df409c7d4bda9. Chain 2 (Bitcoin): anchored in block 959118 (2026-07-22T10:01:58Z), 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/QZFZ22287467.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9117739b74175e56f2c6373d9546c2a74ff137cc7e21c693a5f2ba9206b51b3. 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/QZFZ22200199.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb282b228596b50d69dcf7a412cf8cf78c65ab1d9478df0c696b1acd1bd29740f. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/QZPLS2129335.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc961892f29293b2e0f53ae0506700135d44128f52373eedbdc2472003afef181. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/QZPLS2130455.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xebeec702f2ad69b2cdcd2f4fbbd93e31167cb3d8c26084585fa1b68d282d2e92. 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/QZNWR2137254.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87817057cff9dd2a86c530741716ee6563be3622ecaa3b8ddae9c04cd5158b85. 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/QZMEQ2181920.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd531717d628092245b8e8f84802880f31997cff0a2726c74a71f2b62e9adae62. 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/QZMEP2129646.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe26270a35f7674c7e602e8090d079649dcb88e2f39dec3e22d80b9d3878e4dcf. 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/QZMEM2100157.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x082094499d84ea26d87962e961e6fd49e324fa7871a24358b8208035c43c684b. 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/QZK6H2171608.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46981cfb09b035040611d0ba8cf16f833a216d9be4c96a65b8269d32046cc438. 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/QZK6H2170779.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1eb459ec6ed8f5a30409649dafab7679bd62703afd4ba0c2fd62b9e76990e5b. 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/QZK6J2181473.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0a0411b1127fc6c3679ca29c097fd6375ba135220f7f00ed706e1e32f05a7c9. 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/QZK6L2102780.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8adab739c96219660e0cd48ebbac0829df5bc5874b17673d665909f4069b81fa. Chain 2 (Bitcoin): anchored in block 960212 (2026-07-30T05:43:45Z), 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/QZK6N2106901.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7bd484f3f8783d53c1eff839e83f08ba85a319874b2b04d7113e5b7128a0db0a. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/QZK6Q2132452.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f62b09be618bda961116254230b74e85af639d93d5a8619dbd945d955877f40. 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/QZHNA2159259.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5871e14871f9f3bdc0313908a62999c62918b355f213f3d6c4a84729bce2c43e. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/QZHN92116696.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc1400be66d39d82f5dd8b51ab738eb11015100978f46d8009d1f92cabc6f9c1. 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/QZHN62143423.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa342122346bac2d035a50a5b9138d6fc9e2b6e8dbdd6de1fc5c718f2c51533a9. 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/QZHN52161163.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07b9b6ceed990614c62380cb5c671dd1fda665c2b42269f6706841a48f33497e. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/QZES92198783.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe342febc3051a3da70c4a19448024634581e54bd54c3cc3ded0e464461348416. 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/QZES72139096.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3cffe8654ec50f0e5c38af7ecfbeabf0cf57fd23734be50a9dca88ea9081760b. 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/QZDA82192679.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e3b02442b575c4a9dd9295fab213bbd8f26ed073133cec15ca49a571a9c4141. 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/QZDA42193557.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93cf184453d833659cc16a444b6eb5ec7b705d4b4ef71f8d2c28716824785d84. 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/QZFZ52103444.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38276861e2279d5b232313cc4df787a04355ce7b63184286336a0cc8b6aa3784. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/QZ5AB2176418.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7512ba07387006fad0e3c304174455c7c0e4fee70ccda83e8349acd93539def8. 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/QZNJX2073394.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58fdacc7ae65768f377f059b3c03a849b39e0619f8fa89e76f31a8b9c35d83cd. 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/QZHZ62036167.