Negative FX was a hardcore punk band from Boston, formed in 1981. Though the band lasted only a short time, playing a total of five shows (six flyers exist), the band was well known for their involvem
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25008f72bfe775e26aeb99d8f04e805d80e4d8c890fe936b8e139f756aef8c22. Chain 2 (Bitcoin): anchored in block 953842 (2026-06-15T22:22:30Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/e50731a9-da0a-4e1b-a3bb-5b8c588bf373.json and https://artists.proofprofile.net/proofs/artist/e50731a9-da0a-4e1b-a3bb-5b8c588bf373.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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd572d6e6bd2ae5ad515c4868dfac7d1206cd7227354e9d6a2bef216519964ec5. 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/USA560815968.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x859f809f05075af03203f8172deac7223b6cc9c72525c36588ccfc8a5ed7aac2. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-16T23:59:28Z), 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/USA560815971.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x120700cfbc6422703c291a53a089c7caaabe905e7cc00dc497318c0981973737. 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/USA560815973.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7bd44d1eb1894d9d11f8b771d59e66cac88ac523008b48b372b603bd12f160e. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/USA560815978.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68ba37d5927b3e67fca7413ed3cac66c36a46d8a272533383413c82018a11c6c. 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/USA560815980.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4584435ae2e6de80fc16c3864666f738e9265fa27664abb6bb35083d28eb13d. 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/USA560815981.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa9c74d71a05bdbdc6a15ad9b90394071a5753e040fb751fe929a68f544ddce8. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/USA560815982.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e916f8707e7e353d6ade46d482311ff68829b390ee9adb8456a863740c96fc2. 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/USA560815983.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b9b8990f67db5f97fa61ef9c39fa01a221b4cac59fe60a83543f97949bd24da. Chain 2 (Bitcoin): anchored in block 956349 (2026-07-02T11:34:59Z), 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/USA560815985.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x988ecc3a7aa0d52d65061d82b1ba25e10430dd90d12efcc57e41117c4f1d44f8. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-17T00:04:05Z), 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/USA560815986.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa58cf69a00cf7c7ef3c57f82a9c8aa118963370fc4c46221dc086b6c1f64993e. 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/USA560815987.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa1576adbea9a64f7f828855e0980bcb28b65ffb5273cd0e14f0718fc309e78a. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/USA560815969.
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 0x65fe41743de7427bc4d57526cc8d0b9516001f748f610a0899e21c6495115d53. Chain 2 (Bitcoin): anchored in block 960314 (2026-07-30T21:00:46Z), 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/USA560815970.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5709870096394af7d8c7379cee8951e06d286f1cd833bb132886042b2b26d09. Chain 2 (Bitcoin): anchored in block 960317 (2026-07-30T21:35:24Z), 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/USA560815972.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8bb6d924962994689fffab96ffafaf2a576954adfd38b93ff08005bcf0208444. Chain 2 (Bitcoin): anchored in block 960370 (2026-07-31T08:38:45Z), 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/USA560815975.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07a9b4ef9811e9b7bc1a119ead5f1d727f0867f95e7105e9dc324e67b3c6e104. Chain 2 (Bitcoin): anchored in block 960435 (2026-07-31T16:33:26Z), 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/USA560815976.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x292720baa248b3b53ed86787e1d308993979b26e3564bd2c33734121b6edd748. 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/USA560815977.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43c724bb2685b4492beebb41b540d61b8deaafd4a644f650fe17fdfa3ca64957. 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/USA560815979.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b34c75666c43f81d24b2af4ca222c6d7367e7cf7df9e81cef88fe0c4103ce9d. 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/USA560815984.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8863bb68b78b36ec81e4fbc9e65e63f8e127c688bf64624fad67c0a6a8f8a1bb. 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/USA560815988.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcac507d27fac5d99cf6f27bdee06af9848753c6a44d5b9a7b34a6309fb28b10c. 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/USX5G9600501.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x931a409079fdceef4445af5e6e3bb0a7f09c257158c089fd39dd293d1faa47c5. Chain 2 (Bitcoin): anchored in block 956349 (2026-07-02T11:34:59Z), 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/USX5G9600502.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a5a80bd2ad9c76aac2841e9a5336ea1a754e3a7327c3457cb12e695369eba39. 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/USX5G9600504.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4863e83cac21e9a4cdd7dc68dcab82da1f000781b39539fe38f83a0b8777b65d. 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/USX5G9600505.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x836f1ee94777c9dfff60a0d3ba9a34716a30f37bf28e4ae8e30f73648c6ce951. 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/USX5G9600507.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53e25209a146d2f9430842bf0cefd1633dcf0d74044c86970a29196fc5659cf3. 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/USX5G9600510.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3dc8a6fd82094a022e883fc9c61cbbf1e4ddd4a95b21e0fde47b229da6cf5490. Chain 2 (Bitcoin): anchored in block 956351 (2026-07-02T11:38:34Z), 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/USX5G9600512.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8483ae53d3c053c1aaca8b5cb14405cc74078e0124bb250aefa644617a4768e. 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/USX5G9600522.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa60c321d9aeb6732921ba8008e978c0e465246736e20410631ed9fd2f8de7cec. 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/USX5G9600523.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11b04f64ac836bfc27e6cf9abe76a6e46b56cc7dd18ce08363b443fb256a4264. 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/USX5G9600508.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec8d8f5c87a06620b562d8006bacf15f1af5813395c230a981b95e0b7592b1f7. Chain 2 (Bitcoin): anchored in block 960247 (2026-07-30T10:42:33Z), 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/USX5G9600511.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c03d4d74254b566660964dd29bef9bd88b8d87be62fe353e213199c8891de57. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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/USX5G9600514.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26a57d0bae8034e9e980679070d35753285b2cf22bd64342f3e75c6d4e8ce84f. 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/USX5G9600516.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8343c8089438bd54e1cd4ab76b252d99f03e87949905655fa2864d7657953d0f. 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/USX5G9600517.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8ce94d7f936101b7ac8559ba2d379e44f149c403676406d88612f406d9e21ea. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/USX5G9600518.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x350f6e3a61a206c0d6b54a7b42769fcee4256f0d81f66dc0ad1c4750147262c5. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/USX5G9600520.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf2fd1f117dca4338009d6248c93ceabe0befe2aecdb2fe8e28e1b3b3072e146. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/USX5G9600521.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d1bdec7163baa0031c1b47f40cf4737332ccde599f688d513908f7f711209f9. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/USX5G9600524.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15c919ca2c223a91cb3e38799361b41b6c0391f70f5c47166de4476894edfa11. 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/USX5G9600525.