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 0x315ef8274d08c28555b45e18248de4a67799d5e40770d7edc75b4f9842f2af33. 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/c7294601-cbe8-4cd1-b05e-be54f66ab71b.json and https://artists.proofprofile.net/proofs/artist/c7294601-cbe8-4cd1-b05e-be54f66ab71b.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 0x215df541bda8087430c9e109551b0974bf280b4b069f0102fed47d45884e7d20. Chain 2 (Bitcoin): anchored in block 959094 (2026-07-22T03:33:16Z), 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/DEE881512304.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x443cb98160256918b5eab35805e58c93126b29891bc1487a89b20bcc0726f15b. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/DEE881512312.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26acdc37df5806ba617a41b86bd768df44d5104d138b578bc688b4e13ef541e2. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/DEE881512313.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35231d6a27f9ef1e859ffb3adbd6dfbb80553eb7e2eae86f6a81722fc69d4793. Chain 2 (Bitcoin): anchored in block 958060 (2026-07-14T20:39:42Z), 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/DEE881512302.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19e981a00814d49d2510e7c412b5112cc8555d1b9936453552a5338d826812f7. Chain 2 (Bitcoin): anchored in block 957642 (2026-07-12T02:46:48Z), 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/DEE881512305.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf96e2b92e4f89332403a102a2869e2f4a5451d7cf9539fe3dbe0ac5c88b57687. Chain 2 (Bitcoin): anchored in block 958800 (2026-07-20T00:52:19Z), 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/DEE881512306.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf9d1c32c680e099794e38ab856f41795354307041d045ea9d0b8856e6c7930b. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/DEE881512307.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44b6569c8303200d88c7a8519428fb776e42fd2bed37f563cfa99f7f0d3b7b2c. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/DEE881512309.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e29a234f28df38b900766d9500687b500381917bb9b3755cca735fdfb4b2e20. Chain 2 (Bitcoin): anchored in block 956738 (2026-07-05T04:47:21Z), 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/DEE881512311.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e8beaf65fa655c28d45b028b89e251368b7df9e5143fe5eabedae44e05c9819. Chain 2 (Bitcoin): anchored in block 958390 (2026-07-17T09:35:49Z), 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/DEE881613001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5301e87ecacc69c0a986fe47b35a2cc7378ad7404b5a973e24926fc1cf59b0c. 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/DEE881613002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x737bb442f1b90d482b3ab50ad3e668a3162c4c48114e8f6ed5311ca4cd118670. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/DEE881613003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b7bb8f66b886ec4fee51c20054f048f397b7f2b3bd247aac026088dc3621605. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/DEE881613005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b7696bf8a073efaf830b7f8714ffa332db962f9137cba73469fcd53f5e20a6f. Chain 2 (Bitcoin): anchored in block 958436 (2026-07-17T16:42:22Z), 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/DEE881613009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa781e54b2f179ace259115c7600279dd533229be31517c2e74f18fdbd77fd4f4. Chain 2 (Bitcoin): anchored in block 959132 (2026-07-22T13:20:46Z), 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/DEEH61702597.