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 0x8e515b934321051e6f279a31775a61c953ae6acfb856b59e1865c26b570dbb0e. 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/63e0a7c5-8181-4c51-a65f-857b1c35eb7f.json and https://artists.proofprofile.net/proofs/artist/63e0a7c5-8181-4c51-a65f-857b1c35eb7f.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 0x19108b8a22cde55fbc024598a245c094bae4c0b8fdb2a8f891f748455c8ed49e. 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/US74V1801202.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6c44519038ca58b4dbedb65de0ebfce6e82b39df01fff20eaeadc85c6dc2488. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/US74V1801113.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8995698a53785acb27647a2ff0655f491fbfbbc4af93a8181b4dd2a3e2aceb24. Chain 2 (Bitcoin): anchored in block 960125 (2026-07-29T15:38:18Z), 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/US74V1801114.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe82e3ab2ba3b6c6f0cb54f352622d4cd706a7af529b20c4cb3d6072e5f5dccd2. Chain 2 (Bitcoin): anchored in block 959152 (2026-07-22T16:23:52Z), 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/US74V1801111.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11ad2a00d3e94313eef0f1a75490113b3723d2304da0bd441e838b09697fba6d. Chain 2 (Bitcoin): anchored in block 960163 (2026-07-29T23:20:38Z), 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/US74V1801112.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86af99e8af74d03b9626f263794e1f641dc89b7d7fd25bb560ad33aa08bc6813. Chain 2 (Bitcoin): anchored in block 960209 (2026-07-30T05:15:54Z), 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/US74V1801311.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7325d8db908b9c0748a328c1f8eb80b20eb27124bcdb921c2434cdbb73b700f4. Chain 2 (Bitcoin): anchored in block 960167 (2026-07-29T23:42:34Z), 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/US74V1801313.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c52a1106fce6897842a7a5deef683091a9a2fa7c1616ff2356fe576b74f6255. 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/US74V1801201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x441fc76f294b375049cecbbbc08c80471b81a7c1a3be57ed286923b2c5890447. 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/US74V1801203.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff783d292863e533112a82a743eb966b3689b8cd22a375da622f3afbb97fd39a. Chain 2 (Bitcoin): anchored in block 960247 (2026-07-30T10:42:33Z), 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/US74V1801207.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77fc48fe499729e35f7c6ffb0ad82d83517cb287bee6cd59a0c2821d973b4ef0. 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/US74V1801304.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x455153234968e1af76f0ea11b89f5064f4af9b22373886f5d477dd704f037633. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/US74V1801306.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb74ec23c20e9beefcdf0f46589256e67434a3c06fa5bd3735f0d8996133c3f71. Chain 2 (Bitcoin): anchored in block 960108 (2026-07-29T13:09:35Z), 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/US74V1801312.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x052285de730ca47a0302042cf254753de47fc222d0ece66d86606149ab6a18c2. 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/US74V1801208.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2e7169ddb74b0283cc32e2a76cc56fff1f78fa919e6525543924aa7dc708274. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/US74V1801301.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb8a28f24b6af9237e9f8d18a1f6bacf86679ce1c35cdc309b060588fac78876. Chain 2 (Bitcoin): anchored in block 960296 (2026-07-30T19:11:09Z), 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/US74V1801302.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d9581b93cd482106561ff760647bed1fb5e5172e00c722c1741436b19ce46e6. 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/US74V1801303.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4b866f9f9a96802efd3dd2474b6925318f7818197ef5844e852e32b13408262. 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/US74V1801305.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67f5102c0d2f534d3a2bf7b51d0f84dc1f427e61ca12b2b441ee07a770f68d54. Chain 2 (Bitcoin): anchored in block 960247 (2026-07-30T10:42:33Z), 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/US74V1801309.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe26fc6125e4e9233b5a0d599cc39ada18d36fb2a428c947d5bd2d87cf50b6a59. 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/US74V1801310.