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 0x5485b52754c9ac569ac0d7635c6c63d8aa2d1dcda5c35c96510001335fef6ba4. Chain 2 (Bitcoin): anchored in block 954066 (2026-06-17T08:11:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/66050ead-d86f-45c2-8b04-9563fc275eb2.json and https://artists.proofprofile.net/proofs/artist/66050ead-d86f-45c2-8b04-9563fc275eb2.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 0x0c28e2ba6f8f74311dec5230059b63099586d016d5275abf9b076cad311cb8cd. 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/PLI367912420.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15c2e56b3ea38c561987b5ecd15fdf66c62040f821e58a2c22367ad35c0dfbe0. Chain 2 (Bitcoin): anchored in block 960300 (2026-07-30T19:42:40Z), 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/PLI367912500.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0683e3e6d477f03fd325e867e22937d79a564a04047e22b0300803a648eaacbc. Chain 2 (Bitcoin): anchored in block 960362 (2026-07-31T06:58:00Z), 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/PLI367912390.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeaad158da8078d9b87c9a4012d1f357ad76c2f2a0e5c14e4e82630a41a788e95. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/PLI367912350.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7708e25136121fde142d11c4574773298228dbced9d51e2058416297db286900. Chain 2 (Bitcoin): anchored in block 960314 (2026-07-30T21:00:46Z), 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/PLA881600064.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27eb791aa293f5422b5fd25a7d3a1981b8fffbaf9a77a1c3473d4ff264d5fd3c. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/PLI367912470.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d0541bf97995fe47dfc3a0f6e512c438263be7736e506257f6bd9d7b8aa6c67. 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/PLI367912380.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdad68fdfa71e71dad2c24eb04745bfd1cdee317600c1ab1efd637fdd65457e23. 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/PLI367912460.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8232544ba90ee16323005684274f4d81193daee7b7e5579f094422fa4744a280. Chain 2 (Bitcoin): anchored in block 960300 (2026-07-30T19:42:40Z), 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/PLI367912510.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67975b3bb9a5335fdff0c51612be47a5150501a60008431bb96c1329375bf793. 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/PLI367912370.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x528a9e43f973f468d5de2de21625f78cb046e196c983c78d665d765aa7e8ef9f. Chain 2 (Bitcoin): anchored in block 960317 (2026-07-30T21:35:24Z), 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/PLI367912520.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab163fd1cd9c6516991bd63ec2d4313d7037e3f2ff053b5d9e9507c597b24443. 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/PLI367912530.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xffa1180ff1c1ce5507dd350c1f96b410b7e246158937d8374cfeaeb9f4ac52e5. 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/PLA881700033.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcfc0b8d5334e3807b71fb8a6d502f2740545ccf693255f3c65e0545f2bc64c16. 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/PLI367912540.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0137983f6b8691197af17ca40001f63b7cc43814282dc8b2dfbdcad968bdb48a. Chain 2 (Bitcoin): anchored in block 960203 (2026-07-30T03:35:13Z), 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/PLI367912430.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4e6f6665bbdd8ca7dc3815f6895522bc2070a802f10412fc130d573b7bad70d. 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/PLI367912450.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x479fe00fbd4808664847ebe4db5cf3b872435f01aa7940a3bf150b14fdfa3967. Chain 2 (Bitcoin): anchored in block 960317 (2026-07-30T21:35:24Z), 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/PLI367912400.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd99f8077c7da90d7c26361eaba7d3b389d21c0c56ea90544cc9217429757d807. 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/PLI367912480.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x295243815fe72d4a8f820c6564661f80944811fd621da55b11f4ea95866c503d. 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/PLI367912440.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5cc4fa43f4b4586ac2f1db3d3e1825fd91ff86a327f5376eb0bbfecfa0e349f. Chain 2 (Bitcoin): anchored in block 960370 (2026-07-31T08:38:45Z), 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/PLI367912490.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15d605200094870eac19983c9b915e3375111b5d538479358cb9bf068134fc61. 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/PLI366064880.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdcf5eba3c861e66caa7d1e8ccd125451bfbde4a0dc0cdf21f7e062a5f4c4977d. Chain 2 (Bitcoin): anchored in block 960497 (2026-08-01T02:22:04Z), 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/PLI366064910.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f22ed54210832d8a229f36749a8bbdebaaad19a45a44b09dd871280166c1ac3. 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/PLI366064930.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcbcee8fa9c43f9f9cc1a40183108264783c5e61c0c096bf5caff07ffbe7c05a5. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/PLI366064960.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88185ef885fbe80f3612afc27cf8ee1c67e0b3c157694b4fdf335083990562fd. 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/PLI366064990.