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 0x8620c6388ac394acc60f236aeb85dd288130df63d39624561c4bc9bc411860c8. 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/a629f3e3-a326-4663-9726-1c333fe52adf.json and https://artists.proofprofile.net/proofs/artist/a629f3e3-a326-4663-9726-1c333fe52adf.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 0x86b61401a0fe9315dd24c83a0df07d894fe79d4878e346d2f8cd096d4a5aaca3. Chain 2 (Bitcoin): anchored in block 958383 (2026-07-17T08:20:01Z), 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/QZFZ62470907.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6aeddda77fc4e5d95fddb55f78843ce0a4d412fdb48b63489d5cc5cdd9c129d6. Chain 2 (Bitcoin): anchored in block 956859 (2026-07-06T01:42:12Z), 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/QZFZ62471885.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2246bf09ae3668d98a01d30cd4ca8179deb7d451857f12f5eb0328fe01b05dc. Chain 2 (Bitcoin): anchored in block 958728 (2026-07-19T12:24:55Z), 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/CH6541997814.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5856ab11b4ff9acfb35efc5da4d9f9f0b6b8ba6cf1c42e0756d17575ec8d26aa. Chain 2 (Bitcoin): anchored in block 959087 (2026-07-22T02:05:55Z), 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/CH6541997818.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33f2fb5a3a71cfd5d8235121ad2c1e07fa438203a6d45c36d3554ce0d66168b9. 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/CH6541673751.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24c58796185d24719a149cbb50b45facf7cd5cd6974371eb8c8023c6ecc2be5b. 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/CH6542108847.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4fb62a423e349f6095c2d334dd707964519477910c9e5238ac6af5265690b1f2. Chain 2 (Bitcoin): anchored in block 958341 (2026-07-17T01:08:10Z), 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/CH6542242707.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8072f5d802d1f84b9f1b4569f99fcb315ee6d40a8ee57534582d6ab353f7892. Chain 2 (Bitcoin): anchored in block 958805 (2026-07-20T02:22:58Z), 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/QZFZ62470283.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73bc9adfb2e591c74dba19cadaf0d53a0644141b8bba625e2353bb197a34bba9. Chain 2 (Bitcoin): anchored in block 958134 (2026-07-15T09:14:08Z), 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/QZES82410563.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7a8d347a446e87374e431db94861056572c723fa3deaf2a5a7aa237a5e34b65. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/QZES82414720.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c8aed48c735037e6938abb287c1ddfaad6a68855426e9d2e903e979bcd38f6e. Chain 2 (Bitcoin): anchored in block 958897 (2026-07-20T14:57:46Z), 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/QZES82414755.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb990a587461ed4301d2a0ec92f53e267ea7fa40f5ab6eb806108751b99f2e23c. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/QZES82414797.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6807ce1d17e7c538e41fe8ec41ca2a41b9a1d4678efe09cda26d52973abfb6d6. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T05:29:55Z), 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/QZES82414811.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0cdf533adbd8cef4f086597d8e17cb8f843c6f1b536248f08390f9c4d8d20ec5. Chain 2 (Bitcoin): anchored in block 958696 (2026-07-19T07:45:31Z), 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/QZTBD2320810.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c3b1ff43faa3ddf75541a5fd0975988a947904f7b367597e494771ba5622b23. 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/QZWFM2390634.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeeb358f8583be1eee3b54ac7f369f06f325e0e969a7c2e9bd7d157620b34e04e. Chain 2 (Bitcoin): anchored in block 958208 (2026-07-15T22:40:25Z), 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/QZHN42470868.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x788c96c8944b39f36db602faf9b54dc380894fd19b368867474bbe95c363148b. Chain 2 (Bitcoin): anchored in block 958857 (2026-07-20T09:45:25Z), 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/QZMEM2490252.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1b3b29d3a7484b668eeee389f51d8742f2bffc80f179e20b59a583c3bc2d868. Chain 2 (Bitcoin): anchored in block 958208 (2026-07-15T22:40:25Z), 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/QZNWQ2432350.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34eac4aad6ff7f6b5aefcdef658eaa346091e635b7ad049b4358be0b05f28bab. Chain 2 (Bitcoin): anchored in block 957663 (2026-07-12T05:58:46Z), 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/QZPLR2410253.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x834e75195078163a0a2e91b28cfb7781384d8956505b6bb6b4c5bf72199e6881. Chain 2 (Bitcoin): anchored in block 958783 (2026-07-19T21:20:45Z), 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/QZTB32423228.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3c4d06e5a1b92de9c86d047dfb6c1ae5052efb661b6479e509c3658000e43a5. 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/QZMEM2566754.