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 0xf6f1aff2fa20f33f8a1859b82186c2f1b92ba706ec4e295a3ac6452b5d072cde. 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/ea1ccaff-b1ee-4d5e-9f35-09cceb80352a.json and https://artists.proofprofile.net/proofs/artist/ea1ccaff-b1ee-4d5e-9f35-09cceb80352a.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 0x8f2dddd74e63b7b46e5d9d8dd3c223725a03bf514b57b39ddc0136f30a14904a. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/QMBZ91981146.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6380fda98dc4eb900c071d05175151e8b660c1d2810fd9edc7c8820627e23dd. 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/QM4TX2070387.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e36c8e278e8d1899390da2909e888d69667794944bc4d5784c851ba97e11b45. 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/QM4TX2017623.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f2dddd74e63b7b46e5d9d8dd3c223725a03bf514b57b39ddc0136f30a14904a. 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/QMBZ91981146.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x368ba96c7514162fdd0a72b62595f87414da28ec9af88bf5fb6f5dd0d7c7d689. 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/QM7282058065.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c2ddea8325348238ca9ad35b24e854d5dd920cf2941ca93bc6ba4c4198a0e10. 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/QM6N22060433.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c140bb5106c6f54b404a50737e32717ed58725936864f5e5669e047a9c6fdda. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/QM6MZ2046947.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5ef651b29052e85cc3262b51f12a0958e555ba802e61605d9a9b7cafcb77d63. 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/QMBZ92081935.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd533a25b827e819acdf72c48dfd88f435d5f021882485d347c032341e17a7543. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/QM4TW2062722.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42c64e21b08ee7b52bee975c73e7fec5d293809e20d806b472f0d786fd693452. 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/QM4TW2023565.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c159993e975ba6b4c83b70e31ed63b7ee1cdd53ebb543ec9e05d9c2ab8b11c1. 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/QM6P42020615.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5806c21a76ac2dfbfd83b3c2e118957811a99c216bf0371d72afa13e318f103. 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/ES81G1800006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf88bf02adfb1aef84be4a899eea4e0b9150c384e616f493c9ee83c4bd9ee5a66. 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/ES81G1800007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbecbac79ec29536b0d580bc4d66204627271371d68148d06778be0e96777c17d. 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/ES81G1800008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c7eed84e83bfd49d4640719f3bae704023ab10b05ceb2e79444d7112f35b8c4. 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/ES81G1800009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9a1090f573ec2b8c0ea7fe13ed835a33c2a3da5fd8fbc74cd2bd83306444edf. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/ES81G1800010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6eac9fb5afebb2d82eb7312c05facbd298f0de11a6d32e43548d89436bb1493. 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/ES81G1800011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x157d08fade778bb6213433dcd6b62619e0e58690da5945242516a4d88cc4c305. 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/ES81G1800012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6475db8b2da1d8fb674d5ae9469ce719b158b3204e1ce141e237fd3fe829b2ed. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/ES81G1800013.