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 0x5ece1e1635df6da21d2fe48c8ad841861280a2ddf843ca9fb6c699265a5a850f. 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/808b0c05-2cac-45d2-a046-462992823d02.json and https://artists.proofprofile.net/proofs/artist/808b0c05-2cac-45d2-a046-462992823d02.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 0xe6bf1748252f05f055256cc3fbdf90aa8988bd830d37d9d85c62807665ca88b7. Chain 2 (Bitcoin): anchored in block 958746 (2026-07-19T15:36:35Z), 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/QMPKX1832355.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83460183bd011ee6dbbbfd1c8b03f1b6b407d65c10c74017dc3c1913e9930cff. 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/QMPKX1832366.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe423440a9d2643333ea87cdb6e313ee4479fc96617deaa0aa8e5e6d4ba663f8f. 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/USDHM1507184.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e838cdb1890961712059736ccda96483cb140d937d51c6d35bdf1acef39ec85. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/USDHM1624660.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5223a2e3d63320934461d10f4037fbd2d834849300e29f20f37ec8a2d5e5659d. Chain 2 (Bitcoin): anchored in block 958322 (2026-07-16T20:44:14Z), 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/USDHM1512022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07e528c5da7e345a4856a3665c3edd54b8b7c43eb99f3d84c7f17b281739b29c. 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/USDHM1512025.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72c33b1c4ac60256b90a730b8f5def968ef76e7e623fc54e76d3539b0e1a4023. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/USDHM1512031.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9fc7f9b9f2a5f403fd7ad1f8f1ebbd94da10619aba602a1708bcb46c55b31db0. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/USDHM1512041.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x800fbcee92444df73cff48eb2fa659dd7b72954df32f46317ed09f06f20c12b9. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/USDHM1617467.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x379f6119fbe3445f57aadd17f4a3e2657261eb5d4610527f1509ca325f5488ec. Chain 2 (Bitcoin): anchored in block 956560 (2026-07-03T23:28:02Z), 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/USDHM1617468.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x316fa7ff7fbb6c2e1ac59c99529990c2ef7846e71c045b6c9adb295138b339d8. Chain 2 (Bitcoin): anchored in block 958140 (2026-07-15T10:05:23Z), 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/USDHM1617469.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7b6126773d03c80dee51c7b95f87423073718a16c343140bf26313099387818. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/USDHM1617470.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe36fab475cca306e6724917d59ec75ac98d305f78cd6c05206a4426a0cb78ee8. Chain 2 (Bitcoin): anchored in block 958234 (2026-07-16T03:46:09Z), 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/USDHM1617471.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc871d74036f6b7cf1fa9126a7427b528fc59c860c9e9792ea09bd49d8797b9c7. Chain 2 (Bitcoin): anchored in block 958947 (2026-07-21T00:53:33Z), 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/USDHM1617472.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e5e7bca85ab1c64beaf7e7a533caeb2abc0bdbb5c1332da28889f32f98cf228. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/USDHM1617473.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25fbbc978e46e8773dec520bf50a15f17f75be05638b447efb2a74645cc4e857. Chain 2 (Bitcoin): anchored in block 959051 (2026-07-21T19:48:03Z), 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/USDHM1617478.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77ea12971a69bd86fc733e9fa554e70527f1f5189cc38094fc6594a0ad41a03b. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/USDHM1617479.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6a989f0d93cccde30ecb2ebe6fb273079308c8d5861b422776233d5a49f03be. 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/US3DF1939243.