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 0x78c31c33f63ba3c2d5f792717b7e50074b55263289fe466953cee00d0a72cf3d. 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/306c8165-d331-4467-80a2-b5481277ddcf.json and https://artists.proofprofile.net/proofs/artist/306c8165-d331-4467-80a2-b5481277ddcf.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 0xd1ea9a94ad8aea6f7ab8fb3b4fbca822d846e02540220297ae8be6c1ccbb65f8. Chain 2 (Bitcoin): anchored in block 957863 (2026-07-13T14:41:15Z), 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/CH6541822279.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f46c77a299a603d3dcc9c1b55c5f98ec9b9ae2447582ea476ff4067b7da3238. 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/NLCK41063718.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x798e70a645fdd502099cf9191fc99e6bc4bc790226edc7147455a9dc89b792dd. Chain 2 (Bitcoin): anchored in block 958121 (2026-07-15T08:02:12Z), 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/NLCK41063719.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb50f683ff1c8cc18314dd168442a219b9aca6511b5c4c655b169e6890e753502. 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/FXQ692200150.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf72a34584c94b271e8407465faa2139d44999b8d4337b78630354b167c2ae522. Chain 2 (Bitcoin): anchored in block 958489 (2026-07-18T04:13:26Z), 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/NLS202200249.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x059c643d489ba3cc50ac8a10c766727c2aab4c7f42748976e95021c48fb73b73. 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/US3DF2402337.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfec7a0d666c142be70ad9b7e6472810c4c1fc7cbeb3b5b7c25705dbbe0c11c6e. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/US3DF2414102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3adb14d2b008e5173f26524560c1eda12db071e6ea8351aafb5502476157fca. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T15:22:58Z), 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/QZMEN2423510.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb94b479e99cbed927706bbb60500cad09eafb691fcbf424385bb44aed512a559. Chain 2 (Bitcoin): anchored in block 958271 (2026-07-16T09:16:54Z), 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/US3DF2458742.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0d09a1ad0a9c0fecb83cbda967d7e4c91b3f274a43d502ad15b34a389006661. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/FXQ692400239.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32718efe33c6d4ac42406e7480b025cb96021c31c19d13dbf67b018c91c34411. 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/US3DF2492395.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12ee93adc61e864b9ca5ef4c485160153ba6599d67290a6b6fddd88086b92f02. Chain 2 (Bitcoin): anchored in block 956576 (2026-07-04T02:06:47Z), 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/FXQ692400275.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d710c523b08e9da27964f48cce9ee14acc749a777167b199799c2b9800ef520. 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/USANG2415511.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf89c1af5bec1e857e0ac2ddc7813bbd33e25a846c7ae8043eb9f1dc4ac739a93. Chain 2 (Bitcoin): anchored in block 958163 (2026-07-15T14:38:07Z), 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/US3DF2589194.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b25ef0ddc299dcbcd76b521944af234313a0b00fc8020b51652e75d19175052. 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/GX38U2492854.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16ff4d4b207b85bb43e4f6fc4844e70c610577015ae5e2f5c921f5b85a2b2525. 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/GBKQU2015039.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b0a8b0458ee7365d34e0b8f8e5c255be99effb338c817ffe3fb2dcd72e6bbfc. 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/GBKQU2015043.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85ee54ec2ff2b90ad7aff190fdd0e890c3cad0507e0c784e83486d9d3809506c. 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/GB5KW2300158.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92b1ead22b975bc77d0a75f68589bedf0528076092d853309786047b8689981b. 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/US3DF2408911.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa376c750f893e332939951982335c8120b7909639e3212f3da9217b8af71df1. 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/GB8KE2414416.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85ee54ec2ff2b90ad7aff190fdd0e890c3cad0507e0c784e83486d9d3809506c. 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/GB5KW2300158.