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 0x7c888e6136ba38785923c2f691e0f8c5aa4845a6b4fab221559947c5cc21b442. Chain 2 (Bitcoin): anchored in block 954784 (2026-06-22T02:53:59Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/ea38128c-a99e-4a77-b456-24a5e1f3c0c3.json and https://artists.proofprofile.net/proofs/artist/ea38128c-a99e-4a77-b456-24a5e1f3c0c3.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 0xea01514d46d7e7f725d67f934a7128d9a2191adf33b121d176a8585af8f125ca. 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/QMDA71802738.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6448e363c82bd738e089b9aad16570b274825b0be96ab68eb9a061b9097c0eb1. Chain 2 (Bitcoin): anchored in block 960481 (2026-07-31T23:51:35Z), 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/QMDA71802744.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9cc9e9b508805aafa9fb0f5d77e07296ff9cd83d1617a5f1856f85cd434a6d04. Chain 2 (Bitcoin): anchored in block 960294 (2026-07-30T18:46:00Z), 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/QMDA71802739.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1f115a43f6b8c8ca8be741be2648528dcbae85baea766f6355178d4d3321461. Chain 2 (Bitcoin): anchored in block 960150 (2026-07-29T21:51:49Z), 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/QMDA71802745.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11c5a8ea4f651c6ad6f6392b20e9f8ccf261a6ab4c8692a58504d2942819c243. Chain 2 (Bitcoin): anchored in block 960303 (2026-07-30T20:11:13Z), 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/QMDA71802740.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52a70432da646be194628011ad80a2a4f7f6160e92539fc4f3cc4d017845822f. Chain 2 (Bitcoin): anchored in block 957011 (2026-07-07T08:25:35Z), 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/QMDA71802746.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb680070fd026eaa1495c0f484e8e367616d06fb7114b4fcc97d416be24d19522. 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/QMDA71802742.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x339adfce0066281fbbef0a99021df0ed7f2ec63c27df33a0af57e0c93f2df2c8. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/QMDA71802751.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec32afdbeb3f9c333df3d5330ed6a53c6584dd6222613cc1f69daa3212881dee. Chain 2 (Bitcoin): anchored in block 960459 (2026-07-31T20:22:46Z), 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/QMDA71802750.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb628a0a4965ec0640e11d4727698a40b6740a63bd1815199da2d5c5302d26105. Chain 2 (Bitcoin): anchored in block 960216 (2026-07-30T06:39:12Z), 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/QMDA61843012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x442f38956bad51a846a3cceffd7dba90a355cd24462cbb2c0f523a27c971a606. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/QMDA61843013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae8c65a22e4ce64f08382f8b17589c8b9d4d50dd3ee6fdc96c743e7975731bff. 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/QMDA61843004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8504d3157d84622a48bd6eea0faad964582b0f034040c501a0037f143f84a38. 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/QMDA61843002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4f269989942d0500f3d9c2aa63383826d8b5125224c9ef24238ab663dd23930. 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/QM6MZ1716986.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3a3773f5ebec4a09795c22b7b0661c3b000ce423d3287dcf870b51142cbb9a7. 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/QM6MZ1761525.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf4667026dcea758d82181596ad680602c80fe2ea03a5a7d036569d1de369935. 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/QM4TX1793632.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x193d07b59197552e2579b25047c1b850dd636b7d3e5f9c4251da3f295eeb35b6. 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/QM6MZ1761527.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdddafc7f353cf33929c471991507e7ddbb30db4c22477ff5c61155648bf508eb. 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/QM6MZ1761528.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x289fadb6325d4e30edbcb2a147cf8ee847c8dbf95da0b4502657c1d58e112fe2. 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/QM6MZ1761529.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe8a6cc43dd7c29c25421fb951fca7980a6c8373462edf71a1b0e2470dc1b974. 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/QM6MZ1761530.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba6edda095b3d5b46d274fbd22ba07f0548027b77e26cd8302c2c24ae6128ed7. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/QM6MZ1761531.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6009e62f88e5a69601a8488cf0f76fc9d3bf4cd59fd83841c6065d79e8238a9. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/QM6MZ1761532.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5a0751484494ac80884dbf9f403103d0a8a7e337e75c29871a2da84dbf3437c. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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/QM6MZ1925348.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6496d57d239b9015fe0b8f8cb1ab36056b2ce91a6d5b1155bd53067aaab66d9d. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/QM6MZ1824749.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x830cd50e40b3b627aa7a9b646bb577e45720c2975ceacd9789c7adbbd1c2e585. 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/ESA012083295.