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 0x91841d63e4af7f336c1ae92bb561dac99474eba2dfebe2610a7b68cb1f96fa83. Chain 2 (Bitcoin): anchored in block 953817 (2026-06-15T18:10:31Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/ff902756-e680-4a6a-b985-87b7d6d1dae9.json and https://artists.proofprofile.net/proofs/artist/ff902756-e680-4a6a-b985-87b7d6d1dae9.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 0x4189be3a427616f58069b14198e32a2d53c083891bb34c2d6c2cca842e7cc791. Chain 2 (Bitcoin): anchored in block 960095 (2026-07-29T11:07:37Z), 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/USKO10702131.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef605d340848529614363e3822b285ed789dbc22c77c8b6999e2bd8bf9ee617d. 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/USKO10702132.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0959a13c3cd85516751eaf55a24253c3f4e72c80af433780df0da79866b0b61. Chain 2 (Bitcoin): anchored in block 959132 (2026-07-22T13:20:46Z), 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/USKO10702133.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd997de5e152bdaeeadca5035770274cf2a87fa3d2f4bac0d4e1719855ea5bcc. Chain 2 (Bitcoin): anchored in block 960222 (2026-07-30T07:48:45Z), 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/USKO10702134.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde03736deb8cb89a4ae09828b419b074cf94a9082bdddbb24641b7cbf70644f2. Chain 2 (Bitcoin): anchored in block 960121 (2026-07-29T15:22:21Z), 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/USKO10702135.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97c18dfca9918a701f39548a511e0b6375aa9a2c28269f12340ab5202cbe8a3c. 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/USKO10702136.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f78f6a77688d3659139ffb7cf97f8fc70161cd9ae206851e7c187eacf5f558f. 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/USKO10702137.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa78c02fca69f3303c317808efebb3be93579768309c592ca2fce4838d0fea412. Chain 2 (Bitcoin): anchored in block 959163 (2026-07-22T18:47:29Z), 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/USKO10702138.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7dd400f00323ef7e5d18101a2509242a30687ff3f7c69d1f442dc800cfd4da95. 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/USKO10702139.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x758a7f1aba32a6e92ba4ca352084034680c2e659d6a51d30f4ac874ad8d603cb. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/USKO10702140.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6aa4f5c56f5a3d1ca99106ce5125e4bef3b2a3eb3c8a7e799b54db3ca207c89. Chain 2 (Bitcoin): anchored in block 959132 (2026-07-22T13:20:46Z), 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/USKO10702141.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f23cd772246c70025967241e18b8d905b38869381331776d39b6c61d428f023. 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/USKO10702142.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7f6297f4606f7590bfd5a04b5b074a1588b687f114e16d3e2e426e165f224c4. Chain 2 (Bitcoin): anchored in block 960229 (2026-07-30T08:30:10Z), 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/USKO10702143.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7377b7875a507e77333037af91cee29d8a1d51efd8605dc3b3a7f92707d17d59. Chain 2 (Bitcoin): anchored in block 957064 (2026-07-07T16:43:08Z), 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/USKO10702144.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6cf99ef6ce419abddfb29758c5abc0754904dc507b505de4a7403df5a90f3df8. Chain 2 (Bitcoin): anchored in block 957025 (2026-07-07T10:59:31Z), 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/USKO10702145.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfcbbf2e09e5d5cd082d5295b51c89fc675c0aff9db2be371f3c85a1e7639eb10. Chain 2 (Bitcoin): anchored in block 956894 (2026-07-06T07:53:57Z), 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/USKO10702146.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ba954a14b06a85eb59a396f5d07be18d43f4c1a12e841aaca4ca2b46f52772d. 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/USKO10702163.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad24b47334f7f4269b7d5d29746e6d0b18ab10df596cd6ef04d3549089e5f628. Chain 2 (Bitcoin): anchored in block 960220 (2026-07-30T07:28:30Z), 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/USKO10702164.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78fa289edb43cba4be6a8642b2f64987d69d1088562c1c8b2b7aaa02c4ddaefb. 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/USKO10702165.