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 0x2c144fc19278596104a79a55ac6c9a733f44daac6a10059ddb6c8aaf796572d6. 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/3794bb14-ec49-443b-ad92-57b147f2bc08.json and https://artists.proofprofile.net/proofs/artist/3794bb14-ec49-443b-ad92-57b147f2bc08.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 0x63758ab34cc308cce996d6fba396dea2ffddc473da9490016e2d96c9186c8c2b. 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/NOUM70701448.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b7c6760b769ddca297c1b7d8e6fe4dfd3a9a934341bfa60d31eb2532c98485e. 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/NONFM1901600.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e626e18eaa64f0d3ce023a7e985407bcaa2da5ea15cbd9508c829e8dd77ea32. 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/NONFM1901400.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x979ad35a84437fd7fccb4c1178fda6d76151889402fa8b25d9c9e0133550316e. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T17:54:59Z), 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/NONFM1901900.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83aba4e90fe8ed27a461369e2b24877ec9905df1b852d84895e3b31199c71271. 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/NONFM1902300.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x94ce159560e016cfcdebaf6df1e2b12b8e2b48cc031c47e872d6187fe650fecf. 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/NONFM1902400.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e626e18eaa64f0d3ce023a7e985407bcaa2da5ea15cbd9508c829e8dd77ea32. Chain 2 (Bitcoin): anchored in block 957075 (2026-07-07T18:50:38Z), 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/NONFM1901400.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x160cad327d5e53c91f990d1d8c0030df2e3e98dedcccbc107a54d85378e07ac0. Chain 2 (Bitcoin): anchored in block 959145 (2026-07-22T15:39:05Z), 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/NOUM71200350.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9eea8306b5614ca3b3695c3f8261bff3b3da2d58094ff4916bf3939be5362343. 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/NOUM70600600.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed469514e0953c66582566744a9911fcd762c6056a5a2e8cdf0f3d0b6f3d0886. 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/NOCYY1003010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x747ac8377039f2925e7da093d3a62a3637be3190070d3e97e19bd6a2abc1dd2c. 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/NOCYY1003020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d3109cb12d1d066bef4d33b7a95a43de9670e97b600dbefdb9c7ba60ad9a072. 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/NOCYY1003030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2fdda9838a28e1da0e073f3d81874e1725a5f7a6d5fef0fc6903f42397bd6c11. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-16T23:24:29Z), 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/NOCYY1003040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaac6b604c3e1a03718b68f80261405c381374b178c4e4999d48a9dfd36f6a01e. 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/NOCYY1003070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30016a2e71dc796e72ec513977ed5b4806e99820dc1ccf7b59131fa6a20452ee. 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/NOCYY1003100.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x51ecb9021722762a0986dd5a9b6a50803c9587625dfb9303fff125af3858c819. 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/NOUM70600319.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x310825e3d0ebf2529c7d936ce59508894b1cdf3215bd0b1454e8648bbcadbade. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-16T23:18:36Z), 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/NOUM70600321.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7437ad40f56536588ce263c9d419c25bacc488e3463411315ca2a56c228b347b. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/NOUM70600322.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf62c41567d73e1659238b5f4c3369da5a438aa6615d6331c56bf0361863bb663. 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/NOUM70600324.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03acb2f4dc75f47fa66bb29bb377212f8115dbad4a0e1c0903546d15b3a4c6cd. 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/NOUM70600325.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d0a87a92d494d9f091a25b2d222d41b0c0fffc7cf8f905302f4689683793358. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-16T23:32:01Z), 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/NOUM70600326.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a6aab57368da94b859b7b4a39943dda9cca0dfe66ab972596e6fa3c75a2405e. 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/NOUM71502447.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8ab1ab5b77a6ed5aa6a05958a447bea1a8e446574e48c87b854eb159456760f. 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/NOUM71502449.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc57e5eb23d8b30b0127d224c05db9a3527ab12df895bd64262eb528c1022ef7d. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/NOUM71502455.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e40676de6e4366c05c724ae96d60623b2e01f3c91f14eb0f0edad8ef76d2216. 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/NOUM71502467.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11f60e7424f2b87e5f6ac54fcfd85c040e9396a6d6fd98c9d75a9b892fe0d536. Chain 2 (Bitcoin): anchored in block 959138 (2026-07-22T14:10:55Z), 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/NOUM71502503.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8f4317bc63080ba03b6324b8924cbeaf8e7a568fe601b0e242c18255aef44ee. 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/NOUM71502504.