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 0xd257dab27bddbaff07d8b89e29c891ffe34d5889375b62f59e850d626a586c1e. 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/0a032e81-fef6-4b25-88fc-ff7581323070.json and https://artists.proofprofile.net/proofs/artist/0a032e81-fef6-4b25-88fc-ff7581323070.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 0x6ec497b609e538a79764b22d73788aeb67a5db255bb1eaa0f74c13597e18610d. Chain 2 (Bitcoin): anchored in block 958152 (2026-07-15T12:00:27Z), 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/TCADR1884906.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae67f8859543fa85bb2e357fb039572c688d1bc78a6ab40d6be8e7528c47a562. Chain 2 (Bitcoin): anchored in block 958594 (2026-07-18T18:05:01Z), 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/TCADT1868318.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0d580e6699dcbb41a092388e44170e108ab88f2e29e737ed3649cc6d4eeec3d. Chain 2 (Bitcoin): anchored in block 958197 (2026-07-15T20:40:29Z), 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/TCADT1868332.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x830ce18a2960dd9994ebbe5b6ce92fd5c91a2615c64582e4c01ee67227b32b89. Chain 2 (Bitcoin): anchored in block 959031 (2026-07-21T16:15:11Z), 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/TCADT1868367.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ba35e10fe90fda44f0b18a1e95a2e69036c2c960725b1f6c9e0fbb689e0f0b9. 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/TCADT1868368.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a0a1c3e9795b7cfd355daeebf3251089ca5e38bdae1b6ad62fe5d5f4cce40e0. 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/TCAEI1971562.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd5d9b911d9d64c691b5da4680b0fbc9b3e0183744c2bc871215fe236fdd427b. Chain 2 (Bitcoin): anchored in block 958238 (2026-07-16T04:30:31Z), 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/TCAEI1971570.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4fc0975a853c9616c1b0b878fb93b3c5e9a824eceafbd0146b54791c69293f02. 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/QZC5P1800311.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33d3c827f1b5fac18ad54b0214f31ef13e03114debdff65f1a7e9912fa832da0. Chain 2 (Bitcoin): anchored in block 958329 (2026-07-16T21:48:38Z), 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/QZC5P1800312.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd5f22b020c7fb3df25eba892d827b8cac01b4228e529cb9e4e08db2e48404a1. 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/QZC5P1800284.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae1c42fb75d70962553ade8296bc05386b8b42a82292976c875da13586f20af4. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/QZC5P1800313.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8129753922d841bbc59e61bdb65ff022b25fbc3535e8bb9e52f4408bed72e4b. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/QZC5P1800314.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc6cfe1c1008d58d09598f0c1210a6450b556732f0c2d2598e16d2397eb20689c. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QZC5P1800316.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75661ce3affb79bfcf4bd825b7b6625c3e6915801a67a811958e711861334061. 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/QMPKX1889411.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x80dc74e88d163c765b20921b860f36e67ccbb162a01f557cbf05235bc2804abe. 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/USUYG1299637.