Macs, MACS, etc. may refer to: Medicine Manual Ability Classification System, of manual dexterity in cerebral palsy Minimal Access Cranial Suspension, a form of facial surgery or rhytidectomy used to
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 0xeb2efc4367ff3d86e8890589bb3419ef6674835855c1dd8cbe66e96a105c7d49. 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/7d75806e-23c3-45d4-a2af-503325cd69d3.json and https://artists.proofprofile.net/proofs/artist/7d75806e-23c3-45d4-a2af-503325cd69d3.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 0x2c1fa11e59243e0b5bf862c757306502a6335a5c56aeadd125b7286ccaee6d10. 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/TCAFK2158476.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1562613006b604622bbccce71fb879200b8fea9a86364fd9d2c4ad3dbde118a. 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/TCAFM2121856.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0dfe7a63772950879fa4302fbee9d836a7182ed129e2c2c7c5c1bdb40bc57941. Chain 2 (Bitcoin): anchored in block 958211 (2026-07-15T23:24:33Z), 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/TCAFM2121857.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb14ece1fb4808d475e16b38103519725dbe64747c65ce93737e59e9569e02e66. Chain 2 (Bitcoin): anchored in block 958903 (2026-07-20T15:22:45Z), 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/TCAFM2121854.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66a19841976121b95cbd4317a766766174725a46c6c534695c8d9ebca42f7971. Chain 2 (Bitcoin): anchored in block 958163 (2026-07-15T14:38:07Z), 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/TCAGC2236829.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3bac228a9a14b5304e645f272b4daf1ea1615b49e288c1118a09d492da42f39. Chain 2 (Bitcoin): anchored in block 959107 (2026-07-22T07:19:23Z), 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/TCAGC2236830.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6605703b088b3da8b9f20bf527eb32f70f1e50a3254cbcf355dc2c57d20ce84. Chain 2 (Bitcoin): anchored in block 959087 (2026-07-22T02:05:55Z), 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/TCAGC2236831.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8aaabc16aebd95a9c1910b6d1c4fdbc01143c6a64d8ccbe4908c5c6d619c9b52. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/TCAGC2236836.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x116906945350f83e705390a87fa9c8f34e51f582752491f80db83c3fb1fba5ed. 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/TCAGC2236838.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04bacb6dd160005d2428f572bd28c88a3fab0088df1ef8d7ac3723f4afdc8cde. Chain 2 (Bitcoin): anchored in block 959018 (2026-07-21T14:12:28Z), 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/TCAHL2371797.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x94674bfc8e2ce88d89cb93d4fd87e9f051a1153e1d72d096fd6ee544a5af54f2. Chain 2 (Bitcoin): anchored in block 959089 (2026-07-22T02:17:57Z), 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/TCAHM2359799.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1f72a24ed5dbd9d621cdb164d6c58f2dcd1cea440853d5811708560639f2335. 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/TCAHM2359809.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69f59025af2dc55b00b17267730b0f62d1a2c44c4ce394671a8d0d7749af7ef0. Chain 2 (Bitcoin): anchored in block 958163 (2026-07-15T14:38:07Z), 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/TCAHO2383219.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34cbd8ad39de18f05e1786f5b16d60a9f043cf1c56a1f1a7ca69e0a79ebc2e6a. Chain 2 (Bitcoin): anchored in block 958208 (2026-07-15T22:40:25Z), 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/TCAHR2321071.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc1c24c73fe1fe37231a1742f9b95af2fa023bc13edc75b749a6adc67cd79fb0. Chain 2 (Bitcoin): anchored in block 959088 (2026-07-22T02:14:33Z), 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/TCAHY2464454.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ad9700f40ebb647c3df09059d92767bd2b2e438aff9830d8b2c965739759370. Chain 2 (Bitcoin): anchored in block 959065 (2026-07-21T22:00:50Z), 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/TCAHZ2407152.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b820a39419a2331f9f060f0f0593ed483e2718ffaa8f3ac4434c6b8e0607da9. 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/TCAID2412669.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6eca7aa85904eb68f9d1f5b7d580e8353eeb106e8662e2ebcb6b9b3e7d27e5d. 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/TCAID2412672.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x600e8df79f7a737445c1099e8dfae7b48ab8dc88621f7223f5fe37a8b0592f36. 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/TCAID2412686.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x08a64696163233dfe7cf3b24f3fb0f0eff88478bc470bab50b7957565170c7ff. Chain 2 (Bitcoin): anchored in block 958074 (2026-07-14T22:45:25Z), 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/TCAII2426144.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13c1d0b6cc5c8646c15fd4f090589fee1247271631831cf190444b8813865eda. 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/TCAJS2515338.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe854c71d8b590eabae48e793c0c3b61d9d58958bedd78f0c68d71944cc024a86. 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/TCAKA2528641.