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 0x42e504037dbc64c13a104115428191898a5bfdf9e22639569e8597a0846cefda. 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/a5af1bbd-7243-4159-b6b6-af044a2817f9.json and https://artists.proofprofile.net/proofs/artist/a5af1bbd-7243-4159-b6b6-af044a2817f9.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 0xc79a061cc73b43e7a4ef9015f8ef96288dcc8c6b7aa50ed86f45f8044db3bfb1. 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/QZMHM2201566.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc16661f12b3f780ebdd62c943bad7ec8adcaa4950332c445e4489f060d164a33. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/QZMHK2229808.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e5af3d48ec21dc2e2829f56a6c585c6fa4b57fa7eb7c2624ae4c351f0506bb1. 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/CA5KR2452369.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b057067533497c68e7ec53c667b12b757cb4d599169006378db7180aef24fa8. 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/QZS662455144.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x884c8cc88f3bce629b44590a8b41f121f3d21d9ef58e689d9d3f81e22ce98b85. 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/QZMHL2476547.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xccf9449c667afafdaf93426e4047923da8045f6008e0aa7028442f90e82644ca. 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/QZMHN2351267.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4fc187556e1d6213c924d2daa601bc9bf90850c9d092d222ef390a1cef3d1c9a. 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/QZMHN2340143.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x543c4f62dbc0e1db036466463169a3694fa9a091bc1a478f6e31c7f36f5e5fed. 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/QZS642351459.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd294f9f472dd2f94d28ddddf1f1b5a49edbd3569595c42b9f0805611fb4730d8. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), 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/QZMHK2397717.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x522a250a1f01c806248829b52a327c598c9bb2fbef76d5f8b663b6bf93cbcf6a. 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/QZMHP2394467.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a42caddc9aa95093bec52dc33aa311b5180fc472f26f95c735b06dee669f393. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/QZMHM2227345.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe33ea220824253ca9d32d1dc4383d5ce8bf441e3715a91dbb4b005f29e7189de. 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/QZS642236461.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa7383b4307fbc3703bbf6de9887c241f23be460f8b7247cc7654c06dcecb523. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/QZS652226699.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb933b3b0b03fff796118a6e90ce28e9453dee08bdb56b396d0e308afb42c33f1. 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/QZS672275680.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x887aa8354779dcb1a06ef75c65fc74c5c925cf16c84a48915d547daacd8f6f47. 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/QZMHL2273116.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x435a501448e951bb79d21bef7caaf291ed9637745556949df80ecd29b9e34a5f. Chain 2 (Bitcoin): anchored in block 960218 (2026-07-30T06:57:05Z), 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/QZMHK2250050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7dacccc9f41e0eb665aa4a3dec05e3f9db0c99bbd4cfe0fe377f6f77db1c4770. 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/QZMHK2289981.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b4b3511211990bd048d87c2ae9c77c8d8d65b1e0296567e136a0487e5079213. Chain 2 (Bitcoin): anchored in block 960240 (2026-07-30T09:57:33Z), 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/QZS632258485.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9cd0da934d8e46b578991f269bdd5778f055d05e1d697b788487e5968024350a. 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/QM42K2214532.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27d5864a8f0d73dd5357f0da4b5193263359b25493d6056c1cca21246b6a9aa3. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/QZS672154602.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f54aff134193f2e96597f1ed92075961484e1c613c7cead7cc68241264cc202. 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/QZS662141961.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1dcd0f2286d603324e5edfcae82a4f6fede3eae35f8782391b8d609e1b0ff25a. Chain 2 (Bitcoin): anchored in block 960487 (2026-08-01T00:15:43Z), 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/QZS632127504.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c74f721a5144890da45b2c306ff578e8b329dd383cdea26b5c2a9b188aa9625. 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/QZS652157795.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x08620a18a2436759e2832174547b8672e3f4d060e6c34bfaf30d235ad8a1ff63. Chain 2 (Bitcoin): anchored in block 960294 (2026-07-30T18:46:00Z), 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/QZS652143326.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d18e3e152a3abcbaeb7684b6be119d4873c399e7b0840b4c5affe1e3fdeecd9. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/QZMHK2058645.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33cef23aade603f2341a881e9338c973b1cfac51c313f85008704edb369f9d5e. 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/QZMHP2094943.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x317ab72fe35c978cb965c34c9d82340482dad72ae6431eb57d2cc15dde3ad8cb. 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/QZMHM2076414.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1affeaf9fe3ac7b67a7316360db2b99decc0af090f2dcd45a016a38651599234. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/QZMHL2077814.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x408e36af6f1313a7ded3d1d9e08de3be364790fd4a5e1f8d377e988ef34c3eaf. 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/CA5KR2485872.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd986aa6fcdd6b258c8db846e66c69418aa8848a19e5232e551ffcb193ec570d3. Chain 2 (Bitcoin): anchored in block 960352 (2026-07-31T05:48:30Z), 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/GBKQU2437515.