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 0x57bb34c0dec92130aade008706001e5d307e418c6731e6e6a75d75ff95cc5cdf. 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/e48f3551-6cf9-4ca5-b499-bcbd6b8e1c74.json and https://artists.proofprofile.net/proofs/artist/e48f3551-6cf9-4ca5-b499-bcbd6b8e1c74.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 0xaaac56e4a7d13d23a0249a2b937e54e6cffe96c8d14206a76c670733ed7279fd. Chain 2 (Bitcoin): anchored in block 958596 (2026-07-18T18:42:38Z), 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/QZWFQ2380034.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e07efecd3acca9892ab8ed05fadbd01eec49918dd80fe6e76d6533b61d7e2f1. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/QZWFQ2380035.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea9ed7740621eedd227caacf4afdb19c0ea37fc41388d40b446ed577d367bc19. 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/QZ5FN2428507.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdbb38641ff3f77cce9eaef4ec454b1ab03ec43d1f19df4ff7557cb5f413d4086. Chain 2 (Bitcoin): anchored in block 959105 (2026-07-22T08:53:52Z), 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/QZFZ72413131.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3fbcba00411e9f5e3afb58410da5f74df6051f0487c1ee5331ee906450f3e9ad. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/QZFZ72423475.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x858f6fffbf53b4ed0284292ebda09baee78e452fb07ba4413368667296a401c7. Chain 2 (Bitcoin): anchored in block 958716 (2026-07-19T10:15:55Z), 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/QZDA52420391.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcaa28aae46e3917ac9a329a7722fdb077644c04c858e7d63f69fe26bc5eb60c7. Chain 2 (Bitcoin): anchored in block 958662 (2026-07-19T04:43:15Z), 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/QZHN92497920.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x953d5d3af8931f6ffc85ea20c2797878de5f1041b434839673cccb4322173a16. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QZK6G2471202.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d1a76488daaa5b912d908e98716387b7ee3b504be6b2d763488ac98b8427c64. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/QZK6H2442456.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7dc1dc3322ea484387016ba16792336e812684482c13b10ddaf83dc34c804b9. 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/QZK6N2472055.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x304240ca8d92f01c3c2057445ad220d08d26f15ef38cce3a90ae98a439e2bc61. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/QZK6K2430766.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e82a358fd599400c3eebffe349199129a6c17868171c616409097e6987be07d. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/QZES82488598.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3093c47fcf327232a4eada278ab5568e467986fd05fa193d784d5ce9ecd569a. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/QZHNB2432063.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6cdc148397eb2f6e3aa7421afbed3933aa318614f6eafc5598a9da6174fc64e5. Chain 2 (Bitcoin): anchored in block 958383 (2026-07-17T08:20:01Z), 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/QZES52410899.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd98aa172c3bf5fc40be73a2c60a8fc58387355011b127866d170f85db01daa73. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QZK6P2410750.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdbb38641ff3f77cce9eaef4ec454b1ab03ec43d1f19df4ff7557cb5f413d4086. Chain 2 (Bitcoin): anchored in block 958544 (2026-07-18T12:14:37Z), 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/QZFZ72413131.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x192723894ad0b5cbc5b88219edb5be43bc66948a8035e14c69411f849a26c5fa. Chain 2 (Bitcoin): anchored in block 958965 (2026-07-21T04:29:05Z), 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/QZK6N2478777.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43ba2505001baccdc3b92c61a662a280471b9e046000acbf11b5714e6825e095. Chain 2 (Bitcoin): anchored in block 958585 (2026-07-18T17:05:16Z), 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/QZMEN2483670.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48d8fc85ac7eaf2f8198cddae4358607c4a730345c0b36502707101afa0c9e41. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/QZNWT2418769.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab72d6d602bf97e5d16cf95e6a23c67739afe66eef0800df0e48547f4ff1c6f6. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QZNWZ2490394.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6bfb666f2c78224357998698edcdf3f060941b9894740eb6b7610afce726bbaf. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/QZPLS2481028.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1833b97ed422a34980a65710bdf6c7e542fecef8f4cfae709f275af11767192. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/QZTAS2413498.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40629b00e3f31d810008370d65083002df6409b2f7cbfd7d22d6fc4c700ed909. Chain 2 (Bitcoin): anchored in block 958716 (2026-07-19T10:15:55Z), 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/QZTAT2428813.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe22ab92fd3f0b8d457c5f349f0fdb3529bc3061b3ace266d02bc9e2871ddc763. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QZTAX2458678.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77ac3c5eb9492fe3559d4a21e818d4961b7982d94eb1f5c1730c19759d686065. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QZTB82439743.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a94cc10c8e07715195017d5a75c028c88cac3fef980456ca682e6339ff40abe. 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/QZTBA2452926.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0652c482123d6046abd85eb36a55983b09417128694a0a296f49bfeee6c1809. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T15:33:36Z), 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/QZTBD2447519.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda7a3dda3d3946f3c54f266a4011e3b0248b6371effe78f1f3df922ee54a715b. Chain 2 (Bitcoin): anchored in block 958689 (2026-07-19T07:11:11Z), 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/QZWFF2499087.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca929bc1bc80053d9fadbf71f031a1081a44b9d7eba2f39aef79854cdf41a52e. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QZWFR2443019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b40abfb16db9dc675e8edc9ee6ed1405a88ab352feceae2c946a3ab050a2702. Chain 2 (Bitcoin): anchored in block 958600 (2026-07-18T19:24:05Z), 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/QZWFR2491173.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcff3d1db69c77a680ad4a05e2a832daa3b4ad15adc4f30c34c36696b44733dbc. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/QZWFT2478686.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4aef8cb56b05886b5f5eb7e6bf176e6b9d903d63ad3a9fb28982320d7da04fbf. 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/QZWFW2414214.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc27f00c80d12a28c2d2088f74f88beba8d226fa44cfcd4b63848e5358f7b237. 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/QZWFP2580964.