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 0xf9ada2addfaf7e65ca4732aa40184314586259885b7672e2a25c68064217d749. Chain 2 (Bitcoin): anchored in block 954717 (2026-06-21T15:47:51Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/f6df59f2-d06d-4497-8a0c-976442578910.json and https://artists.proofprofile.net/proofs/artist/f6df59f2-d06d-4497-8a0c-976442578910.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 0xeffc094df01d7f16ba35b56eaf827b37b5f34503626c28047e34140d5ef0c0a2. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/CA5KR2167899.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5212852407c707a90ffa9b55404c155c404a86eb372b6dadc053e2a56b08a0f5. Chain 2 (Bitcoin): anchored in block 960381 (2026-07-31T09:50:11Z), 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/CA5KR2167902.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x707d94e41ad5b761d8a6af3df4d21035528c05abaebb15bc8f010e0a17fdfa99. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/US83Z2487871.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0d83ffa2b819b0738c32f16848e2672aae70f368f46250697e1bac5d443dab3. Chain 2 (Bitcoin): anchored in block 960241 (2026-07-30T09:58:01Z), 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/US83Z2487872.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b0ca1617c29ded82fd44a0a24dbc3d37a47f1cff8ed5e35996b80ff9088643d. Chain 2 (Bitcoin): anchored in block 960173 (2026-07-30T00:11:40Z), 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/US83Z2487887.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54e2215e42488eacb4a1f86ac56373518cd27642a3aa61cb5001cb6c4635a5ef. 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/US83Z2487876.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e1458944cada3dd457904613fe130f8802d8b49de939a76761f7958a88fae6f. 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/US83Z2487883.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef8166dc15323622f19e1dcccf2ebe68dfd25033d31d1ed35fc9ab11bc921bb6. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/UKR6V2291844.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2797690ddcc5022bb54b7f77d1c7de12e34b5931bdaec3912cd212521aa7adf7. 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/UKR6V2291845.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b85d25ce9bd21633f33027e7386cf60859d2c1b0d45bc5c3b41f541bb597305. 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/UKR6V2291842.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8fbd2d07872c9a587c473b1ea10516119d379a93eee44054f756963163648290. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/GBLV62401391.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e77be5933cc4491759c050c9e7c0499b78e22aa7c8eeaf8d5ade9b89f23d8ca. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/ITZN72300222.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4387753c9c85fc1746eb70327090bd1e74d36a5950a3c1498c5bdfbeffafb367. 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/ITZN72300223.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8187c49237b81b7b3738647a67f0ed72c1836c7f1bde1d10606f23cf3ad8cf3e. 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/US83Z2479144.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9fac5df59e2aec2c943eb97f9f5bb9a74b15eb3acc7b3cd8ee005e3397402d12. Chain 2 (Bitcoin): anchored in block 960185 (2026-07-30T01:32:48Z), 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/GBKQU2434457.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf731c105d2c241decf52cc4c4e9d77f170033e8de4287bba87a535abc33c357. 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/ITZN62200443.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e66a65942cd50d75c621ae15bb1d4087920a1dcbc9e917d47c6862e9b1d8bbc. 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/US83Z2427872.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x409ecd04fe860f4b725c2049450b575b31fa4b318bbae9baf0406f8e3a8c4e9c. Chain 2 (Bitcoin): anchored in block 960236 (2026-07-30T09:37:10Z), 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/US83Z2427883.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f12a84404a3d6f903a97adf8bde586b8c8f938920474c368d77048ad42f749f. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/US83Z2427882.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86c6ca4bf5968d006a417c557a9e9dba07e164d5d3491b6d2519296e2f977301. Chain 2 (Bitcoin): anchored in block 957046 (2026-07-07T14:04:01Z), 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/US83Z2427876.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18725ade6b91fd44cef4b0211f002fbcbc0bfc0a579f7f0bffa6a5a2aa15d0ea. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/US83Z2427879.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f8aa8ba0e40b598b71433bf2ee473b700eb778a5edbab373b44e009b0b9641e. Chain 2 (Bitcoin): anchored in block 960485 (2026-08-01T00:10:46Z), 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/US83Z2427877.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa11486238b3b20a928c3cddb56fe4023b7c0451125c2b49c58c7d3f0e856d0d0. 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/US83Z2427881.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e271cde15e59bcee998b283de71c02f9fdeeb20940d0ffb645f7158395bce68. 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/US83Z2517064.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3cd427ebc30bb8ec45885bb9ba8c5d2e349ebac3aaee94e0175ec2d71f164631. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/US83Z2517065.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3727e6514eeb814a84ac419c42117e851954b6bb75c484dcccd46bcc05d188e. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/US83Z2517066.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed51c8b73dd2715c5727ce79e0a56ae8c9ef8da9e34026f5f63c1b6d504f72cf. Chain 2 (Bitcoin): anchored in block 960298 (2026-07-30T19:26:00Z), 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/UKR6V2490883.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02db0f144343b34aeddcfbbe1d8395b3bcdee5e7ef00819b6b4572ff38e3f8bf. Chain 2 (Bitcoin): anchored in block 960212 (2026-07-30T05:43:45Z), 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/UKR6V2490886.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3bd41298f4e76322033f8aff4ff001c0d759e4d620e19b5ba7f48a031e0d437. 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/UKR6V2490888.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5bcdd32e86c7d24fdd028d0bd1892bbb5bf33d6ab7670db793046b787734a84d. 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/UKR6V2490891.
Back in Black! (The Very Best Of) Chapter 19