RKCB may refer to: RKCB, a Los Angeles–based alt-pop duo featured in "Speechless" (Candyland song) Roman Key Card Blackwood, a bridge convention
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 0xdcf8f4a165237bd2d93f06e531c963850c7520f14d371b683fb0d2c6ab433a1b. 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/73032211-c403-4d40-bcb8-891cdf549422.json and https://artists.proofprofile.net/proofs/artist/73032211-c403-4d40-bcb8-891cdf549422.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 0x851edcc8fa6ac5214884b416850f99cceb997bc7566fc3e4dd827a5c98766013. 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/TCACK1525373.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11147f8769b7db0516d54e172ecae54b4848656244f6bdebb4a0a3b9e843d09e. 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/TCACL1665236.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe58649ebe13e8f9f9409d961ddc1c3dac5d203aa821f4f19ab2dbc87b3ecb5d7. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/TCACQ1627344.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40ab86e9d0a24a38b01402064e313b2ecf1b0bb4142a509f4681da6956bd7f45. 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/TCACS1685855.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84476c4bb880a68ab95fefeda8346964d2a06f7d9250323c02fc08bc2df35273. 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/TCACT1653712.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed9d34f449df7183e200955b0cc3f9b3eb8ef81ade8adc59aec9edc4c809c555. Chain 2 (Bitcoin): anchored in block 958901 (2026-07-20T17:54:49Z), 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/TCADA1789646.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x725ff56a6277a13163207f310f04a6aaf267a99bba5480b99803b0606d6b842d. 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/TCADI1723597.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbaf848978c4a520a0fe3037ba02cfbd023677356701b040e086e3f0c08829424. 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/TCADI1723599.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e2588b96004c6b04c4a7b220b7cbb7ecb8913500be013e622ee2122f2e58985. Chain 2 (Bitcoin): anchored in block 958678 (2026-07-19T05:59:57Z), 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/TCADI1723601.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3db8d846150861ea6a044ebb030bc7caae776893e437f453b1438fb5d6896cce. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/GB45A1801152.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2fb394c15e56c10a685bb68815a91268133798fce012e96ce507fe80cc610858. 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/GB45A1801189.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87effdd865490c404d4c361e1609411ed7bbacc2136fde77de6f4b4cceaf9bc3. 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/GB45A1801191.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcea810daaaa4b8eff1eb4c2a8dd1a96e82dfa153fcd3362f82e9be53a80d6344. Chain 2 (Bitcoin): anchored in block 958121 (2026-07-15T08:02:12Z), 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/QZNWX2083874.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3faa16ee5425a823472f31dc9b4efd1d1e5006905a04c3934dc1c8f948e4eefc. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/QM2PV1638590.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0d07d04bb6851828a5e70296a03e479c3241ea61f68433bc75b330392688e42. 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/USWB11601291.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b8da5ac5e7b448fc74d1f35aa0ae695f860eaec424d576fb17b4dcc46c3dfcc. 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/TCACJ1507545.